Wiki 4.1

Coop achievement

Do headshot kill
Complete a butcher action
Kill enemies while sliding
Achieve x5 multiplicator
Achieve 2 headshot kill in row
Kill enemies with melee attack
Kill enemies using grenades
Kill 7 enemies in row
Kill an enemy while sliding with headshot
Kill enemies in the dead using pistol
Kill enemies using defibrilator
Kill enemies with melee attack in the dead
Kill enemies using mine
Kill enemies in the head without aiming
Kill enemies while using silencer
Kill enemies with pistol
Kill enemies when you are knock down
Kill enemies in head while you are prone position
Kill enemies using knife