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.
Hijack an Atlas mech.
Kill 5,000 enemies.
Upgrade any weapon to level 10.
Kill 10 guardians with headshots from the front while their shields are raised.
Mission accomplished.
Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Make the final assault.
Obtain two non-customizable suits of armor.
Defeat an old adversary.
Deliver most of the Galaxy at War assets to the final conflict.
Send a warning across the galaxy.
Extract ancient technology.
Call down an orbital strike.
Disable a group of fighter squadrons.
Sabotage a dreadnought.
Overload the shields of 100 enemies.
Establish or rekindle a romantic relationship.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Reach level 20 in multiplayer or level 60 in single-player.
Finish all multiplayer maps or all N7 missions in single-player.
Attain the highest level of readiness in each theater of war.
Discover an enemy's monstrous origin.
Evacuate a scientific facility.
Kill 1,000 enemies.
Reach level 15 in multiplayer or level 50 in single-player.
Kill a brute while it's charging you.
Kill 100 enemies with melee attacks.
Win a political stand-off.
Explore a lost city.
Perform any combination of 50 biotic combos or tech bursts.
Defeat a harvester.
Survive the swarm.
Destroy an Atlas dropped from orbit.
Complete three multiplayer matches or five N7 missions.
Complete one multiplayer match or two N7 missions.
Stop a Cerberus kidnapping.
Kill 250 enemies.
Lift 100 enemies off the ground with powers.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Bring a veteran officer aboard.
Escape a Reaper in the galaxy map.
Set 100 enemies on fire with powers.
Visit a store in the single-player campaign.
Chase down an assassin.
Evolve any of your powers to rank 6.
Modify a weapon.
Return to active duty.
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.
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.
Investigate a strange occurrence in the combat simulator.
Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.
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.