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