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

Defeat 250 Enemies with Headshots

Kill 5 Enemies with 1 Explosion

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 Easy Without Changing the Difficulty

Kill 50 Enemies by Melee-Attacking from Behind

Defeat 50 Enemies with Hand-to-Hand Combat

Kill 50 Enemies with the Dragon Sniper

Kill 50 Enemies with the M4

Kill 30 Enemies with the Moss-12

Kill 20 Enemies with the Pistole