Play in the water in the dam in Halebidu

Get through all 3 Axe Fort trials without resetting any boards

Break stealth and re-enter stealth successfully

Open 5 lockboxes

Defeat an enemy with the last bullet in your handgun clip

Pick a three pin lock in under 15 seconds

Use all the zip-lines to traverse the city

Shoot the imposter.

Shoot 5 of them in a single level.

Avoid whatever he's flinging at you.

Earn 42 Gems.

Earn the Gems in the bonus levels.