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.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Deliver most of the Galaxy at War assets to the final conflict.
Kill 5,000 enemies.
Overload the shields of 100 enemies.
Upgrade any weapon to level 10.
Lift 100 enemies off the ground with powers.
Reach level 20 in multiplayer or level 60 in single-player.
Attain the highest level of readiness in each theater of war.
Perform any combination of 50 biotic combos or tech bursts.
Establish or rekindle a romantic relationship.
Hijack an Atlas mech.
Kill 100 enemies with melee attacks.
Kill 10 guardians with headshots from the front while their shields are raised.
Start a character in multiplayer or customize a character in single-player.
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.
Complete three multiplayer matches or five N7 missions.
Discover an enemy's monstrous origin.
Call down an orbital strike.
Reach level 15 in multiplayer or level 50 in single-player.
Kill 1,000 enemies.
Disable a group of fighter squadrons.
Obtain two non-customizable suits of armor.
Sabotage a dreadnought.
Evacuate a scientific facility.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Win a political stand-off.
Explore a lost city.
Kill a brute while it's charging you.
Complete one multiplayer match or two N7 missions.
Defeat a harvester.
Survive the swarm.
Destroy an Atlas dropped from orbit.
Stop a Cerberus kidnapping.
Kill 250 enemies.
Escape a Reaper in the galaxy map.
Bring a veteran officer aboard.
Set 100 enemies on fire with powers.
Modify a weapon.
Visit a store in the single-player campaign.
Chase down an assassin.
Evolve any of your powers to rank 6.
Return to active duty.
Finish the game on Insanity without changing difficulty after leaving Earth.
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.
Investigate a strange occurrence in the combat simulator.
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.
Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.