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.
Upgrade any weapon to level 10.
Finish the game on Insanity without changing difficulty after leaving Earth.
Finish all multiplayer maps on Gold or all single-player missions on Insanity.
Establish or rekindle a romantic relationship.
Kill 5,000 enemies.
Mission accomplished.
Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Make the final assault.
Defeat an old adversary.
Hijack an Atlas mech.
Deliver most of the Galaxy at War assets to the final conflict.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Kill 100 enemies with melee attacks.
Reach level 20 in multiplayer or level 60 in single-player.
Attain the highest level of readiness in each theater of war.
Lift 100 enemies off the ground with powers.
Kill 10 guardians with headshots from the front while their shields are raised.
Perform any combination of 50 biotic combos or tech bursts.
Start a character in multiplayer or customize a character in single-player.
Send a warning across the galaxy.
Finish all multiplayer maps or all N7 missions in single-player.
Extract ancient technology.
Complete three multiplayer matches or five N7 missions.
Call down an orbital strike.
Disable a group of fighter squadrons.
Reach level 15 in multiplayer or level 50 in single-player.
Kill 1,000 enemies.
Sabotage a dreadnought.
Evacuate a scientific facility.
Discover an enemy's monstrous origin.
Win a political stand-off.
Overload the shields of 100 enemies.
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.
Set 100 enemies on fire with powers.
Destroy an Atlas dropped from orbit.
Dispatch 10 probes to retrieve people or resources in Reaper territory.
Stop a Cerberus kidnapping.
Kill 250 enemies.
Escape a Reaper in the galaxy map.
Bring a veteran officer aboard.
Modify a weapon.
Obtain two non-customizable suits of armor.
Visit a store in the single-player campaign.
Chase down an assassin.
Return to active duty.
Evolve any of your powers to rank 6.
Learn more about the Prothean Empire.
Find all required intel to help Eden Prime's colonists.
Investigate a sinister conspiracy.
Uncover an ancient secret.
Use clues to pinpoint the exact location of an objective.
Rescue a civilian from Reaper forces.
Free Omega from Cerberus Occupation.
Find the Talon leader.
Complete all the Command Center side-missions on Omega.
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.