Get 40 headshoots in a game
Get 6 kills with a single grenade
Kill 5 civilians in a game
Use a civilian as a shield to stop a knife
Shoot down a helicopter by throwing an explosive barrel
Kill the driver of your own boat
Go down to the arcade and hide until time passes without killing anyone
Kill a civilian with a bullet reflected in the UZI
Get 50 stars of story mode
Kill 2 soldiers with a mortar bullet
