Send a warning across the galaxy.

Kill 1,000 enemies.

Set 100 enemies on fire with powers.

Evacuate a scientific facility.

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

Disable a group of fighter squadrons.

Kill 100 enemies with melee attacks.

Win a political stand-off.

Complete one multiplayer match or two N7 missions.

Defeat a Harvester.

Destroy an Atlas dropped from orbit.

Kill 10 guardians with headshots from the front while their shields are raised.