Return to active duty.

Bring a veteran officer aboard.

Explore a lost city.

Sabotage a dreadnought.

Disable a group of fighter squadrons.

Extract ancient technology.

Send a warning across the galaxy.

Stop a Cerberus kidnapping.

Make the final assault.

Visit a store in the single-player campaign.

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

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

Establish or rekindle a romantic relationship.

Evolve any of your powers to rank 6.

Kill 1,000 enemies.

Kill 100 enemies with melee attacks.

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

Lift 100 enemies off the ground with powers.

Kill a brute while it's charging you.

Hijack an Atlas mech.

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

Obtain two non-customizable suits of armor.

Complete three multiplayer matches or five N7 missions.

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

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

Learn more about the Prothean Empire.

Rescue a civilian from Reaper forces.

Use clues to pinpoint the exact location of an objective.

Find the Talon leader.

Go undercover to follow a lead.

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

Win a prize at one of the arcade games.

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