I found this guide, and used it from over at Xbox Achievements.  I figured I would post them here for people’s convenience and well to be honest, mine. ;)  Be forewarned though, if you read through all of these achievements, you will see quite a few spoilers.  While for many this doesn’t ruin the game, I know for many of you it does.
Medal of Honor
100 Complete 1 Mass Effect Playthrough on any setting

Finish the main quest. Now, I recommend you start out at Casual. No, Normal is NOT Hardcore, and Veteran is NOT Insane. So, go easy, find out where everything is at. SAVE YOUR MONEY for the next play through. Make sure: You use two allies always! Do ALL side quests with them. Don’t worry, those unlock later on, some times different times in the game.

Warning: If you click the continue below, you will start to see spoilers…

Medal of Heroism
25Complete Feros

Feros is the planet that has the colonists and is not covered in snow. Now, all you have to do is: Talk with the leader[Dai Fan, I think was his name], kill the Geth, now this is important: Talk with him again, then talk with the people in charge of: Food, water, and power, and do their side quests! After that, move up the bridge, go to ExoGeni, find Lizbeth, return to the colony. Now, either upgrade your grenades with the Thorian gas or kill them all. Now, if you kill them and didn’t do the side quests, you will NEVER complete them.

Distinguished Service Medal
25Complete Eden Prime

This is your first mission. This is important: IF you want insane or hardcore, you CAN CHANGE the difficulties in game. DO IT BEFORE LANDING ON EDEN AND/OR passing it! This was confirmed in the Bioware Forums. Now, just kill the Geth then dis activate the bombs by standing near them and holding A.
After that, approach the Beacon.

Council Legion of Merit
25Complete Virmire

Virmire is the planet you receive from the Council. First, you land, clear the AA guns and approach the Salarian Camp. You can get the Charm/Intimidate on Wrex, who will want to get the cure for the Genophage. Don’t worry if you don’t have it maxed out, there’s another chance later in the game. Now, choose between Kaidan or Ashley. SPOILER: Who ever goes with the Salarians WILL die. Arm the nuke, then lastly fight Saren. Mission Accomplished.

Honorarium of Corporate Service
25Complete Noveria

Noveria is the planet covered in Snow, and has Matriach Benezia. In order to get the garage pass you need to help Lorik. Go to the garage, kill the Geth, and drive up. Once in the facility, you’ll need to activate the VI’s core. Either doing the Tower of Hanoi puzzle[search in google for how to do it] or sacrifice 100 omni gel. Then, activate the power and landlines. Once in the tram, you must kill the Rachni, but first go down the elevator to where the survivors are at, get the pass, and to the hot labs. Activate the Purge and get out. Return to the survivors, [SPOILER] Kill them. Go to the end of the place, and go to the tunnels. Find the Matriarch. To kill her, you MUST kill the Geth and Asari Commandos. DO NOT FIGHT HER. Start of, kill the Asari Command rushing you, then RUN TO THE RIGHT and kill the Geth and Commandos.

Long Service Medal
25Complete 2 Mass Effect Playthroughs on any setting

After finishing your Casual, or any play through, select new career and existing ID. Make sure to change the settings in the main menu, difficulty to Hardcore. WHEN YOU START THE GAME IN THE NORMANDY, CHANGE IT AGAIN TO HARD CORE! IF YOU LAND ON EDEN PRIME AND DIDN’T CHANGE IT, YOU WON’T GET THE ACHIEVEMENT!!!!!

Distinguished Combat Medal
25Complete 1 Mass Effect playthrough on the Hardcore difficulty setting. Do not change the setting.

Refer to the Long Service Medal achievement. Things to remember: One shot from Geth Colossus and Snipers WILL KILL YOU! Buy the Specter Master Gear, BUY ALL LICENSES YOU ENCOUNTER! SWITCH BULLET UPGRADES FROM SHREDDER TO TUNGSTEN DEPENDING ON THE ENEMY!! REMEMBER: ENEMIES WILL BE AT YOUR LEVEL! THEY WILL HAVE SHIELDS!

Medal of Valor
50Complete 1 Mass Effect play through on the Insanity difficulty setting. Do not change the setting.

Refer to Distinguished Combat Medal and Long Service Medal.hings to remember: One shot from Geth Colossus and Snipers WILL KILL YOU! Buy the Specter Master Gear, BUY ALL LICENSES YOU ENCOUNTER! SWITCH BULLET UPGRADES FROM SHREDDER TO TUNGSTEN DEPENDING ON THE ENEMY!! ENEMIES WILL BE HIGHER LEVELS THAN YOU!

Pistol Expert
10Register 150 Pistol Kills

Alright, start with the pistol, since it’s the hardest weapon to get kills and the weakest. Register 150 kills, do side quests, for more enemies. Don’t worry, kills carry one through careers. Also, YOU must make the kills, your allies can’t help you here. Make sure you level the weapon up for more damage. Also, be realistic. You can’t kill a Krogan with a pistol if he’s charging you, change weapons for certain enemies.

Shotgun Expert
15Register 150 Shotgun Kills

Leave the shotgun for last, or third, if you want. Upgrade the weapon for more damage. Now you ask, why for last? In the last missions, enemies will be close together, and with a high level shotgun, you can basically snipe them. IF you don’t get the 150 kills, don’t worry, they carry on to the next career. YOU MUST do the kills, ally kills will NOT count.

Assault Rifle Expert
15Register 150 Assault Rifle Kills

This should be the weapon you use the most in the game. Once it is fully powered, you can destroy Geth Colossus and Gun turrets with the over kill power up. Again, they carry on to the next play through. YOU must make the kills, ally kills will NOT count.

Sniper Expert
15Register 150 Sniper Rifle Kills

This is the most annoying weapon in the game. If you’re not level up, it will be hard to get kills with this. Make sure this is your first or second weapon you use, since its hard. YOU must make the kills, ally kills will NOT count.

Lift Mastery
15Use biotic Lift 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work. To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Throw Mastery
15Use biotic Throw 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work.To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Warp Mastery
15Use biotic Warp 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work. To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Singularity Mastery
15Use biotic Singularity 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work. To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Barrier Mastery
15 Use biotic Barrier 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work. To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Stasis Mastery
15Use biotic Stasis 75 times

Create an Adept character or any character with biotic powers. Now, use what every power achievement you’re after on a box. You should get it after a while. Not sure if it would work, but using the power and not hitting a target could work. To find the power, press and hold the RB and highlight the power. YOU must do this, allies don’t count.

Damping Specialist
15Use Damping Field 75 times

For these achievements, you’ll need to be an engineer class character. Simply use these by pressing the RB and highlighting the power. Use it on a box or enemy. I wouldn’t recommend using it on nothing, since I’m not sure if it would actually work. YOU must do this, allies don’t count.

AI Hacking Specialist
15Use AI Hacking 75 times

For these achievements, you’ll need to be an engineer class character. Simply use these by pressing the RB and highlighting the power. Use it on a box or enemy. I wouldn’t recommend using it on nothing, since I’m not sure if it would actually work. YOU must do this, allies don’t count.

Overlord Specialist
15Use Shield Overload 75 times

For these achievements, you’ll need to be an engineer class character. Simply use these by pressing the RB and highlighting the power. Use it on a box or enemy. I wouldn’t recommend using it on nothing, since I’m not sure if it would actually work. YOU must do this, allies don’t count.

Sabotage Specialist
15Use Sabotage 75 times

For these achievements, you’ll need to be an engineer class character. Simply use these by pressing the RB and highlighting the power. Use it on a box or enemy. I wouldn’t recommend using it on nothing, since I’m not sure if it would actually work. YOU must do this, allies don’t count.

First Aid Specialist
15Use medi-gel 150 times

For this achievement, all you will need to do is press the Y button. Make sure you’re damaged, or else it won’t allow you to use the medi-gel. This carries over play any through. It is likely you’ll get it after finishing Hard Core.

Neural Shock Specialist
15Use Neural Shock 75 times

For these achievements, you’ll need to be an engineer class character. Simply use these by pressing the RB and highlighting the power. Use it on a box or enemy. I wouldn’t recommend using it on nothing, since I’m not sure if it would actually work. YOU must do this, allies don’t count.

Scholar
25Find all primary Alien: Council Races, Extinct Races and Non-Council Races codex entries

Note: You only get ONE chance to get MOST of these.

The Council consists of: Asari, Turians, and Salarians.
The extinct Races are: Protheans, Rachni
The Non- Council races are:Batarians, Elcor, Geth, Hanar, Keepers, Krogan, Quarians, Volus

Turians:
At the very beginning of the game, talk to people about the Spectres and Saren.
Asari:
Either talk with Captain Anderson, or with Avina[The VI about the council races].

Salarians:
Talk to Captain Anderson after the first meeting with the council.

Protheans:
CAN ONLY GET WITH TALKING WITH CAPTAIN ANDERSON!

Rachni:
Talking with the VI near the Krogan Statue about the Krogans, the rebellion, and the war.

Batarians:
After acquiring the Normandy, talk with Captain Anderson. Ask him about him becoming a Specter.

Elcor
Talk to the Elcor diplomat Calyn in the embassy. The embassy is to the right of the Human Embassy.

Geth:
Ask Ashley AFTER finding her on Eden Prime.
.
Hanar
Either with the Preaching Hanar, or with the Shop Keeper that is Hanar. Ask him about his speech.

Keepers:
Ask Avina near the Citadel Tower light.

Krogan:
Automatic by watching the confrontation between Wrex and the Krogan bouncer in Chora’s Den.

Quarians:
Talk to Garrus in medical center.

Volus:
Talk with Avina outside the embassies.

Completionist
25Complete the majority of the game

There are in total 67 missions. Now, you can get majority achievement and ONE ally at the same time. It might be a bug or something, but you will get the other ally later on. Here’s the list:

NOTE: I got completionist and both ally achievements by doing ALL side quests[not including Styx Theta Cluster ones, which are two] and completing the three main planets. Should be noted that I got the last ally Garus right when Saren[SPOILER!!!!!! Killed himself, while I got Ashley after Benezia].

MAIN QUEST:

Prologue: Find the Beacon

Citadel: Expose Saren
Citadel: Garrus
Citadel: Wrex

Feros: Save the colony

Noveria: Matriarch Benezia
Noveria:Lorik Qui’n
Noveria: Peak 15
Noveria: Reactor Repair
Noveria: Reconnect Landlines
Noveria: Contamination
Noveria: The Hot Labs
Noveria: Rift Station

Find Liara T’Soni

Ilos: Find the Conduit

Race Against Time

SIDE QUESTS:

Citadel: Scan the Keepers
Citadel: Presidium Prophet
Citadel: Reporter’s Request
Citadel: The Fan
Citadel: Rita’s Sister
Citadel: Signal Tracking
Citadel: Jahleed and Chorban
Citadel: Homecoming
Citadel: The Fourth Estate
Citadel: Family Matter
Citadel: Asari Consort
Citadel: Old Friends
Citadel: Xeltan Convinced
Citadel: Planting a Bug
Citadel: Schells and his Data
Citadel: Negotiator’s Request

UNC: Missing Survey Team
UNC: Rogue VI
UNC: Hostage
UNC: Major Kyle
UNC: Distress Call
UNC: Missing Marines
UNC: Privateers
UNC: Hostile Takeover
UNC: Matriach Writings [10 needed, I collected 15]
UNC: Missing Scientist
UNC: Turian Emblems [13 needed, I collected 17]
UNC: Minerals [ Rare Earths: 20, I found 23. Gases: 6, I found 10. Heavy Metals: 20, I found 25. Light Metals: 20, I found 22]
UNC: Signs of Battle [10 Medallions, I found 10] [ID Tags: 3, I found 4]
UNC: Negotiations
UNC: Cerberus[SHOULD BE NOTED: There is ONE other side quest to do with them on the Styx Theta Cluster, does NOT appear on Journal, search for abandoned ship].
UNC: Prothean Discs[7 needed, I found 10]
UNC: Lost Freighter
UNC: Espionage Probe
UNC: Hade’s Dogs
UNC: Lost Module
UNC: Geth Incursions
UNC: ExoGeni Facility
UNC: Colonists
UNC: Derelict Freighter
UNC: Listening Post Alpha
UNC: Listening Post Theta
UNC: Depot Sigma-23

Virmire: Wrex
Virmire: Kirrahe’s Team

NOTE: DO ALL FEROS BEFORE LEAVING TO THE SKY BRIDGE!!!

Feros: Recover Data
Feros: Power Cells
Feros: Varren Meat
Feros: Feth in the Tunels
Feros: Water Restoration

Noveria: Espionage

Asari Diplomacy

ALLIES:

Garrus: Dr Saleon
Wrex: Family Armor
Tali’s Pilgrimage

Tactician
25Complete playthrough with shield damage greater than health damage

Simply complete the game with YOU having more shield damage than health damage. Take cover often, not much else I can say.

Medal of Exploration
50Land on an uncharted world

Explore the galaxy! I believe I got this when I landed on the moon/planet that has Major Kyle. Don’t worry, you’ll eventually land on a planet that you need to do a side quest on.

Rich
25Exceed 1,000,000 Credits

Yes, credits carry on to the next game. Do all side quests. You get more money being Renegade, push for more credits, sell stuff. SAVE that money for Specter Master Gear.

Dog of War
25Register 150 organic enemy kills

Add the Shredder bullet upgrade to your weapon and allied weapons. Kill anything that is NOT Geth. You’ll get it eventually. Yes, they carry one. Do side quests. The Cerberus ones have a lot of mercenaries.

Geth Hunter
25Register 250 Synthetic enemy kills

Add the Tungsten upgrade to your weapon. By Synthetic, they mean Geth. IF you don’t get this by Virmire, don’t worry. The last mission has A LOT of enemies. Do side quests, there are plenty of Geth Ambushes in the beacons.

Soldier Ally
20Complete the majority of the game with the Alliance soldier squad member

See completionist achievement. Do A LOT of side quests. Don’t worry if you get one ally first and later the other. I got Ashley when I did ALL side quests [except two] and when I [SPOILER!!!!!!!!!!!!!!!!] killed Benezia. I got Garrus when I DID ALL SIDE QUESTS!!! AND[SPOILER!!!!!!!!!!!] when Saren killed himself.

Sentinal Ally
20Complete the majority of the game with the Alliance sentinel squad member

See Soldier Ally.

Krogan Ally
20Complete the majority of the game with the Krogan squad member

See Soldier Ally.

Turian Ally
20Complete the majority of the game with the turian squad member

See Soldier Ally.

Quarian Ally
20Complete the majority of the game with the querian squad member

See Soldier Ally.

Asari Ally
20Complete the majority of the game with the asari squad member

See Soldier Ally.

Power Gamer
20Reach 50th level with one character

Do a lot of side quests. If you do them all, by the first play through you’ll probably get to level 40. There is a glitch that only gives you 300xp every time, but to do it: Find Liara when SHE IS TRAPPED IN THE BLUE FIELD! Kill the enemies, save, then load the save. Congrats, you got 300 points! I would only recommend that in the early levels. Also, make sure that when on the Mako to kill enemies on foot, not with the Mako, you’ll get more experience that way.

Extreme Power Gamer
50Reach 60th level with one character

YOU MUST FINISH THE GAME ONCE in order to unlock levels 51-60. In total, you will need: 862100 experience points to reach level 60. Do ALL side quests, and it is most likely that you will get this at the end of your second way through or third. Also, make sure that when on the Mako to kill enemies on foot, not with the Mako, you’ll get more experience that way.

Renegade
15Accumulate 75% of total Renegade points

See Paragon.

Paragon
15Accumulate 75% of total Paragon points

On Noveria, when you are given the oppurtunity to accept the assignment from Lorik Qui’in to get the evidence to catch the Salarian (Anoleis, the administrator guy who has his own office) in his rend-based scandal, agree to it. He will open up the shut-down elevator, go down there and get the evidence. Upon exiting to go back to him you will run into Gianna (receptionist lady) talk to her then go meet her in the hotel/bar, she will ask you to get him to agree into turning Anoleis in, agree and go talk to Lorik Qui’in. Talk to him, choose the following options :

(Top Right) Testify against Anoleis
*Paragon or Renegade point choice, this is where the
6 in charm/intimidation comes into play*
(Top Left) {Paragon} You’d be a hero
(Bottom Left) {Renegade} Damn right I will

Talk to him again :

(Left) Matriarch Benezia
(Bottom Right) Another Question
(Top Left) Testify against Anoleis
*Paragon or Renegade point choice

Repeat the Matriarch Benezia steps to keep getting +25 point’s, keep doing it untill achievement unlocks.

^ Thanks to Gprime for better explaining.

Paramour
10Complete any romance subplot

You can do this with: Kaidan, Ashley, and Liara. Talk with them after every main plot event. Choose the top dialog. Don’t worry if you try to get Ashley and Liara[you dogs XD], they will confront you and you have to choose. Once you finish the three planets, and reach the Citadel, you will be close to kissing, and when heading to Ilos, you seal the deal.

Spectre Inductee
15Become a Spectre

This is a main quest achievement. Prove that Saren is evil. Talk with Harkin, find Garus, then bring down Fist. After that, you need to save Tali, and with her evidence, you become a Spectre.

Charismatic
10Use Charm or Intimidate to resolve an impossible situation

You get two chances to do this. The first is on Virmire, where you either intimidate or charm Wrex into calming down and NOT taking action. The other chance is in the end where you intimidate or charm[SPOILER] Saren into suicide. You NEED to max out either one, or else you will fail.

Search and Rescue
10Locate Dr. T’Soni in the Artemis Tau cluster

She’s in the Artemis Tau Cluster. Knossos system, and on the only planet you can land on. Drive the Mako till you reach the tunnels. Go down the elevator, and you’ll find her, trapped in a force field. Kill the enemies, and activate the laser. Enter the newly made hole, use the elevator, and kill the Krogan.

Thanks Darth Odan for compiling such a great list!

Mr. Johnson

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