Throw back a grenade and defeat two enemies at once

Defeat 20 enemies with gunfire by aiming while hanging

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

Kill 1 000 Zombies

Find ten treasures

Finish the game in Easy Mode

Complete Mission 4 (Any Difficulty Level)

Defeat 50 enemies with stealth attacks

Complete Mission 9 (Any Difficulty Level)

Collect All The Loot In Any Mission

Defeat 30 enemies with the Desert - 5

Defeat 30 enemies with the Tau Sniper