Use a lock pick to open something.

Obtain something by closely examining an item.

Win the water gun fight

Finish Left Behind on Normal

All Left Behind collectibles found

All optional conversations found in Left Behind

Defeat 5 Descendants With a Sniper Rifle

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

Find 1 Treasure

Finish the Game on Easy Without Changing the Difficulty

Kill 50 Enemies with the M4

Kill 3 Enemies with 1 Explosion

Beat 'Chapter 16 - The Treasure Vault' in less than 7 minutes