Kill 30 Enemies with the SAS-12

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

Kill 50 Enemies by Melee-Attacking from Behind

Kill 30 Enemies with the Tau Sniper

Defeat 20 Enemies While Swimming

Defeat 10 Enemies with Thrown-Back Grenades

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

Kill 30 Enemies with the Mk-NDI

Find 20 Treasures

Kill 10 Enemies with Grenades While Hanging

Kill 20 Enemies with Gunfire While Hanging

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