Full list of all 68 Mass Effect 3 achievements worth 1,550 gamerscore. It takes around 50-60 hours to unlock all of the achievements in the base game.
The base game contains 50 achievements worth 1,000 Gamerscore, and there are 4 DLC packs containing 18 achievements worth 550 Gamerscore.
Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Mission accomplished.
Make the final assault.
Defeat an old adversary.
Send a warning across the galaxy.
Finish all multiplayer maps or all N7 missions in single-player.
Extract ancient technology.
Reach level 20 in multiplayer or level 60 in single-player.
Deliver most of the Galaxy at War assets to the final conflict.
Call down an orbital strike.
Disable a group of fighter squadrons.
Sabotage a dreadnought.
Establish or rekindle a romantic relationship.
Discover an enemy's monstrous origin.
Evacuate a scientific facility.
Win a political stand-off.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Survive the swarm.
Explore a lost city.
Reach level 15 in multiplayer or level 50 in single-player.
Kill 1,000 enemies.
Destroy an Atlas dropped from orbit.
Defeat a harvester.
Kill 100 enemies with melee attacks.
Stop a Cerberus kidnapping.
Kill 10 guardians with headshots from the front while their shields are raised.
Escape a Reaper in the galaxy map.
Bring a veteran officer aboard.
Kill a brute while it's charging you.
Obtain two non-customizable suits of armor.
Visit a store in the single-player campaign.
Chase down an assassin.
Return to active duty.
Kill 250 enemies.
Complete three multiplayer matches or five N7 missions.
Lift 100 enemies off the ground with powers.
Evolve any of your powers to rank 6.
Modify a weapon.
Complete one multiplayer match or two N7 missions.
Start a character in multiplayer or customize a character in single-player.
Finish the game on Insanity without changing difficulty after leaving Earth.
Perform any combination of 50 biotic combos or tech bursts.
Kill 5,000 enemies.
Attain the highest level of readiness in each theater of war.
Overload the shields of 100 enemies.
Set 100 enemies on fire with powers.
Hijack an Atlas mech.
Upgrade any weapon to level 10.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Finish all multiplayer maps on Gold or all single-player missions on Insanity.
Learn more about the Prothean Empire.
Find all required intel to help Eden Prime's colonists.
Uncover an ancient secret.
Rescue a civilian from Reaper forces.
Investigate a sinister conspiracy.
Use clues to pinpoint the exact location of an objective.
Free Omega from Cerberus Occupation.
Find the Talon leader.
Complete all the Command Center side-missions on Omega.
Throw a party for your friends.
Win a prize at one of the arcade games.
Stop an out-of-control scheme before it's too late.
Infiltrate an enemy stronghold with your crew.
Go undercover to follow a lead.
Discover a plot against you.
Investigate a strange occurrence in the combat simulator.
Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.