Kill 75 Enemies in a Row Without Dying

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

Kill 10 Enemies with Grenades While Hanging

Kill 30 Enemies with the Mag 5

Kill 50 Enemies by Melee-Attacking from Behind

Kill 20 Enemies by Shooting from the Hip (without aiming)

Activate a Tweak

Finish the Game on Normal Without Changing the Difficulty

Finish the Game on Crushing Without Changing the Difficulty

Kill 30 Enemies with the SAS-12

Kill 30 Enemies with the T-Bolt Sniper

Throw Back a Grenade and Defeat 2 Enemies at Once