Take optional photo #3 in Episode 1: Chrysalis

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

Explore Photo Mode

Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the Tau Sniper

Kill 100 Enemies with Headshots

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

Kill 30 Enemies with the Arm Micro

Kill 20 Enemies with Gunfire While Hanging

Find 20 Treasures

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

Try all three game modes