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