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

Kill 100 enemies with melee attacks.

Call down an orbital strike.

Disable a group of fighter squadrons.

Establish or rekindle a romantic relationship.

Evacuate a scientific facility.

Win a political stand-off.

Kill a brute while it's charging you.

Kill 1,000 enemies.

Destroy an Atlas dropped from orbit.

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

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

Lift 100 enemies off the ground with powers.