Explore a lost city.
Survive the swarm.
Sabotage a dreadnought.
Call down an orbital strike.
Disable a group of fighter squadrons.
Win a political stand-off.
Extract ancient technology.
Defeat an old adversary.
Send a warning across the galaxy.
Discover an enemy's monstrous origin.
Evacuate a scientific facility.
Make the final assault.
Long Service Medal
Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Finish the game on Insanity without changing difficulty after leaving Earth.
Establish or rekindle a romantic relationship.
Hijack an Atlas mech.
Defeat a harvester.
Tour of Duty
Finish all multiplayer maps or all N7 missions in single-player.
Obtain two non-customizable suits of armor.
Complete three multiplayer matches or five N7 missions.
Upgrade any weapon to level 10.
Reach level 15 in multiplayer or level 50 in single-player.
Reach level 20 in multiplayer or level 60 in single-player.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Use clues to pinpoint the exact location of an objective.
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.
King of the Castle
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.
The One and Only
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.