Complete mission "Beneath the Meridian".

Complete mission "Atlas, At Last".

Kill 50 Enemies by Melee-Attacking from Behind

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

Kill 20 Enemies with Gunfire While Hanging

Kill 50 Enemies with the Micro-9mm

Kill 75 Enemies in a Row Without Dying

Find the Strange Relic

Find 20 Treasures

Defeat 20 Enemies with Hand-to-Hand Combat

Use the shortcut in Tiger Temple.

Acquire 15 weapon mods

Obtain all weapons.