Infiltrate the CELL facility at Wall Street

Single Player: Kill at least 3 enemies with a single grenade

Assimilate alien tissue at the crash site

Single Player: Kill 4 enemies in a row with headshots

Complete In at the Deep End

Killed another player while cloaked

Repaired an object for the first time

Used the Brutal Melee move against another player

Completed weapons training in Prologue

Receive orders from Lancer.

Break free from the torture chair.

Take down Castro with a headshot.