Collect a single coin

Survive the swarm.

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

Collect 10 Hats.

Disable a group of fighter squadrons.

Win a political stand-off.

Complete one multiplayer match or two N7 missions.

Modify a weapon.

Defeat a Harvester.

Kill 250 enemies.

Get A Gold Medal On A Diamond Challenge Without Using An Ultimate Ability

Bring a veteran officer aboard.