Return to active duty.

Modify a weapon.

Start a character in multiplayer or customize a character in single-player.

Kill 250 enemies.

Evolve any of your powers to rank 6.

Chase down an assassin.

Complete one multiplayer match or two N7 missions.

Kill a brute while it's charging you.

Visit a store in the single-player campaign.

Bring a veteran officer aboard.

Reach level 15 in multiplayer or level 50 in single-player.

Complete three multiplayer matches or five N7 missions.

Destroy an Atlas dropped from orbit.

Kill 1,000 enemies.

Set 100 enemies on fire with powers.

Defeat a harvester.

Escape a Reaper in the galaxy map.

Learn more about the Prothean Empire.

Stop a Cerberus kidnapping.

Explore a lost city.

Survive the swarm.

Win a political stand-off.

Sabotage a dreadnought.

Evacuate a scientific facility.

Discover an enemy's monstrous origin.

Finish all multiplayer maps or all N7 missions in single-player.

Call down an orbital strike.

Extract ancient technology.

Disable a group of fighter squadrons.

Dispatch 10 probes to retrieve people or resources in Reaper territory.

Send a warning across the galaxy.

Establish or rekindle a romantic relationship.

Defeat an old adversary.

Make the final assault.

Perform any combination of 50 biotic combos or tech bursts.

Mission accomplished.

Kill 10 guardians with headshots from the front while their shields are raised.

Lift 100 enemies off the ground with powers.

Obtain two non-customizable suits of armor.

Reach level 20 in multiplayer or level 60 in single-player.

Find all required intel to help Eden Prime's colonists.

Deliver most of the Galaxy at War assets to the final conflict.

Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.

Kill 100 enemies with melee attacks.

Find the Talon leader.

Investigate a sinister conspiracy.

Free Omega from Cerberus Occupation.

Discover a plot against you.

Rescue a civilian from Reaper forces.

Go undercover to follow a lead.

Infiltrate an enemy stronghold with your crew.

Stop an out-of-control scheme before it's too late.

Uncover an ancient secret.

Throw a party for your friends.

Use clues to pinpoint the exact location of an objective.

Hijack an Atlas mech.

Upgrade any weapon to level 10.

Promote a multiplayer character to the Galaxy at War or import an ME3 character.

Attain the highest level of readiness in each theater of war.

Overload the shields of 100 enemies.

Win a prize at one of the arcade games.

Kill 5,000 enemies.

Complete all the Command Center side-missions on Omega.

Finish all multiplayer maps on Gold or all single-player missions on Insanity.

Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.

Investigate a strange occurrence in the combat simulator.

Finish the game on Insanity without changing difficulty after leaving Earth.

Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.