Kill 100 enemies with melee attacks.

Kill 1,000 enemies.

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

Set 100 enemies on fire with powers.

Evolve any of your powers to rank 6.

Hijack an Atlas mech.

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

Defeat a Harvester.

Destroy an Atlas dropped from orbit.

Kill 250 enemies.

Bring a veteran officer aboard.

Escape a Reaper in the galaxy map.