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.
Upgrade any weapon to level 10.
Kill 5,000 enemies.
Reach level 20 in multiplayer or level 60 in single-player.
Attain the highest level of readiness in each theater of war.
Kill 10 guardians with headshots from the front while their shields are raised.
Overload the shields of 100 enemies.
Deliver most of the Galaxy at War assets to the final conflict.
Start a character in multiplayer or customize a character in single-player.
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.
Kill 1,000 enemies.
Defeat an old adversary.
Send a warning across the galaxy.
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.
Discover an enemy's monstrous origin.
Reach level 15 in multiplayer or level 50 in single-player.
Complete three multiplayer matches or five N7 missions.
Establish or rekindle a romantic relationship.
Sabotage a dreadnought.
Evacuate a scientific facility.
Kill 100 enemies with melee attacks.
Perform any combination of 50 biotic combos or tech bursts.
Win a political stand-off.
Hijack an Atlas mech.
Lift 100 enemies off the ground with powers.
Explore a lost city.
Kill a brute while it's charging you.
Defeat a harvester.
Complete one multiplayer match or two N7 missions.
Survive the swarm.
Destroy an Atlas dropped from orbit.
Stop a Cerberus kidnapping.
Kill 250 enemies.
Set 100 enemies on fire with powers.
Bring a veteran officer aboard.
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.
Evolve any of your powers to rank 6.
Chase down an assassin.
Modify a weapon.
Return to active duty.
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.
Free Omega from Cerberus Occupation.
Complete all the Command Center side-missions on Omega.
Find the Talon leader.
Discover a plot against you.
Go undercover to follow a lead.
Infiltrate an enemy stronghold with your crew.
Stop an out-of-control scheme before it's too late.
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.
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.