Defeat 20 enemies by blind-firing while in cover (without aiming with L1/R1)

Defeat 100 enemies with headshots

Defeat 30 enemies with the Mk-NDI

Defeat 50 enemies with stealth attacks

Play in the swimming pool on the Cruise Ship

Defeat 20 enemies with gunfire by aiming while hanging

Defeat 30 enemies with the Arm Micro

Defeat 50 enemies with hand-to-hand combat

Make five enemies drop their grenade by shooting them

Completed Chapter 8.

Complete one Cooperative Multiplayer game

Find one treasure

Kill a zombie with 10 different melee weapons.