Kill an enemy with each weapon type including special weapons.

Kill 5 enemies while using a zombie as a shield.

Purchase 5 weapons.

3 Tyrants Killed (lifetime)

Accumulate a total of 10000 in damage.

Complete Part I: Suffering.

Interrupt Wyzen's monologue.

Activate Burst for the first time in Episode 1.

Kill 13 zombified teammates.

Fully upgrade all abilities for one character class.

Attempt "The Rescue" and fail

Complete the sixth mission of the U.S.S. campaign.

Complete the fifth mission of the U.S.S. campaign.