Kill 50 Enemies by Melee-Attacking from Behind

Kill 100 Enemies with Headshots

Kill 30 Enemies with the KAL-7

Kill 20 Enemies with Gunfire While Hanging

Defeat 20 Enemies by Blind-Firing While in Cover (without aiming)

Kill 20 Enemies with Headshots

Successfully Counter all of a Brute's Damage-Giving Attacks

Defeat 20 Enemies with Hand-to-Hand Combat

Kill an Enemy While Playing as an Alternate Character Costume Other Than Drake

Finish the Game on Normal Without Changing the Difficulty

Finish the Game on Crushing Without Changing the Difficulty

Kill 30 Enemies with the Desert-5