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.
Finish the game on Insanity without changing difficulty after leaving Earth.
Finish all multiplayer maps on Gold or all single-player missions on Insanity.
Upgrade any weapon to level 10.
Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Mission accomplished.
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.
Finish all multiplayer maps or all N7 missions in single-player.
Extract ancient technology.
Defeat a harvester.
Hijack an Atlas mech.
Discover an enemy's monstrous origin.
Evacuate a scientific facility.
Call down an orbital strike.
Disable a group of fighter squadrons.
Sabotage a dreadnought.
Establish or rekindle a romantic relationship.
Win a political stand-off.
Explore a lost city.
Lift 100 enemies off the ground with powers.
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.
Survive the swarm.
Kill 100 enemies with melee attacks.
Destroy an Atlas dropped from orbit.
Kill 1,000 enemies.
Kill 10 guardians with headshots from the front while their shields are raised.
Stop a Cerberus kidnapping.
Attain the highest level of readiness in each theater of war.
Overload the shields of 100 enemies.
Perform any combination of 50 biotic combos or tech bursts.
Reach level 15 in multiplayer or level 50 in single-player.
Bring a veteran officer aboard.
Complete three multiplayer matches or five N7 missions.
Kill 250 enemies.
Kill a brute while it's charging you.
Complete one multiplayer match or two N7 missions.
Set 100 enemies on fire with powers.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Escape a Reaper in the galaxy map.
Obtain two non-customizable suits of armor.
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.
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.
Investigate a strange occurrence in the combat simulator.
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.
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.