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