Destroy an Atlas dropped from orbit.

Kill 250 enemies.

Escape a Reaper in the galaxy map.

Bring a veteran officer aboard.

Modify a weapon.

Return to active duty.

Defeat ten enemies in a row, alternating hand-to-hand combat and gunplay

Find the Strange Relic

Finish the game in Easy Mode

Defeat 30 enemies with the Tau Sniper

Defeat 100 enemies with headshots

Defeat 20 enemies by blind-firing while in cover (without aiming with L1/R1)