Kill 5 enemies in 3 seconds.

Inspect another player.

Rebuild a Jumpship.

Killed 15 enemies with the Berserker's action skill

Get 3 stars on 1 S.T.A.R. Lab Mission

Send an opponent through all three Metropolis transitions in one fight

Enter Practice Mode

Use the Atomizer secondary fire to kill 30 enemies

Get 50 headshot kills in Campaign Mode

Damage the same enemy in Cooperative Mode for 100 kills

The player has completed the game without harvesting any Little Sisters

The player has successfully invented all possible ammo types