Discover an enemy's monstrous origin.

Kill 1,000 enemies.

Disable a group of fighter squadrons.

Win a political stand-off.

Survive the swarm.

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

Stop a Cerberus kidnapping.

Defeat a Harvester.

Kill 250 enemies.

Lift 100 enemies off the ground with powers.

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

Bring a veteran officer aboard.

Modify a weapon.