Defeat four enemies with one explosion

Defeat 20 enemies while swimming

Defeat 30 enemies in a row with your side arm

Defeat ten enemies in a row, alternating hand-to-hand combat and gunplay

Finish the game in Hard Mode

Defeat 30 enemies with the G-MAL

Kill 10 enemies with thrown-back grenades

Defeat five enemies in a row with headshots

Find 60 treasures

Defeat five enemies in a row using stealth attacks

Stand on the crocodile in the Secret Library

Complete 'We've Only Just Begun'.

Achieve maximum rank.