Defeat 250 Enemies with Headshots

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

Activate a Tweak

Finish the Game on Easy Without Changing the Difficulty

Kill 30 Enemies with the PAK-80

Kill 30 Enemies with the Mag 5

Kill 30 Enemies with the Arm Micro

Play in the Swimming Pool on the Cruise Ship

Kill 100 Enemies with Headshots

Kill 30 Enemies with the KAL-7

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

Kill 30 Enemies with the G-MAL