Perform any combination of 50 biotic combos or tech bursts.

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

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

Make the final assault.

Kill 1,000 enemies.

Send a warning across the galaxy.

Evolve any of your powers to rank 6.

Obtain two non-customizable suits of armor.

Disable a group of fighter squadrons.

Discover an enemy's monstrous origin.

Win a political stand-off.

Defeat a Harvester.

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