Complete level XI

Tried to finish a level while wounded.

Complete level VII

Complete level V

Complete level I

Chapter 7 - Talk to all of the Wilikins

Kill an infected teammate with a headshot before they become a zombie in any mode.

Kill 5 enemies while using a zombie as a shield.

Purchase an ability.

Collect 3 G-Virus Samples in one match.

Win a game by sabotaging a critical system as Impostor.

Kill 10 enemy players in one multiplayer game with CQC.

Achieve a 5 kill streak in a Versus match.