Revive a teammate with one second left on their timer. (2P +)

Buy all of the weapons.

Play a single-player game.

Kill eight enemies in eight seconds using the Darkstar Fission Tether with two or more teammates.

Fully upgrade one weapon.

Defeat the Wigwump.

Buy half of the weapons.

Kill 50 enemies with the Vac-U 4000.

Buy your first weapon.

Play an offline-only game. (2P +)

Complete Chapter 3 in Chris' campaign.

Complete Chapter 1 in Chris' campaign.

Single Player: Kill 4 enemies in a row with headshots