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.
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.
Upgrade any weapon to level 10.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
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.
Send a warning across the galaxy.
Lift 100 enemies off the ground with powers.
Kill 1,000 enemies.
Finish all multiplayer maps or all N7 missions in single-player.
Extract ancient technology.
Perform any combination of 50 biotic combos or tech bursts.
Complete three multiplayer matches or five N7 missions.
Kill 100 enemies with melee attacks.
Call down an orbital strike.
Reach level 15 in multiplayer or level 50 in single-player.
Disable a group of fighter squadrons.
Sabotage a dreadnought.
Evacuate a scientific facility.
Establish or rekindle a romantic relationship.
Discover an enemy's monstrous origin.
Win a political stand-off.
Explore a lost city.
Set 100 enemies on fire with powers.
Complete one multiplayer match or two N7 missions.
Kill 10 guardians with headshots from the front while their shields are raised.
Defeat a harvester.
Survive the swarm.
Obtain two non-customizable suits of armor.
Destroy an Atlas dropped from orbit.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Escape a Reaper in the galaxy map.
Kill 250 enemies.
Stop a Cerberus kidnapping.
Hijack an Atlas mech.
Bring a veteran officer aboard.
Kill a brute while it's charging you.
Visit a store in the single-player campaign.
Chase down an assassin.
Modify a weapon.
Return to active duty.
Evolve any of your powers to rank 6.
Start a character in multiplayer or customize a character in single-player.
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.
Investigate a sinister conspiracy.
Uncover an ancient secret.
Use clues to pinpoint the exact location of an objective.
Rescue a civilian from Reaper forces.
Free Omega from Cerberus Occupation.
Complete all the Command Center side-missions on Omega.
Find the Talon leader.
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.
Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.
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.