Uncharted: Golden Abyss Cheats for vita

Library puzzle

When you enter the room where Sully is associating with the crooks, you will first have to kill all the guards. Afterwards you will have to solve a puzzle with the statues in the center of the room. Press Select to enter Sir Francis Drake's diary. You will see that the four statues are next to either north, south, east, or west. Then, exit the diary. The center of the room has a compass painted on the stone. You must turn the statue to the same direction indicated on the compass. Once completed, a secret door will open.
Evan
Unlimited ammunition

Get over 300 medal points then press Start and enter the "Rewards" menu. Choose the "Weapon Select" option and pick from the available weapons. You will get a weapon with full ammunition. Simply re-enter that menu then repeatedly select and deselect that weapon to keep refilling its ammunition.
Jak And Daxter reference

Look at the scuba suits Drake is wearing at the very beginning. It reads "Ottsel" on the chest part. An Ottsel is the type of creature that Daxter is.
Gitano Moua
Jak 2 reference

On the "Plane Wrecked" level, there will be a platform before you walk on the first log. There will be a treasure by the tree. Pick it up and it will look like the red orbs from Jak 2.
Rashaad Jones