Acquire all trophies.
The One and Only
Defeat a group of Spectre-level opponents on Normal, Hardcore, or Insanity.
Investigate a strange occurrence in the combat simulator.
Score 9999 points in the combat simulator on Normal, Hardcore, or Insanity.
Complete all the Command Center side-missions on Omega.
Finish the game on Insanity without changing difficulty after leaving Earth.
Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Finish all multiplayer maps on Gold or all single-player missions on Insanity.
King of the Castle
Win a prize at one of the arcade games.
Kill 5,000 enemies.
Upgrade any weapon to level 10.
Free Omega from Cerberus occupation.