Make the final assault.

Send a warning across the galaxy.

Finish all multiplayer maps or all N7 missions in single-player.

Discover an enemy's monstrous origin.

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

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

Evacuate a scientific facility.

Establish or rekindle a romantic relationship.

Escape a Reaper in the galaxy map.

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

Defeat a Harvester.

Survive the swarm.