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