Harpoon a killer whale.

Kill a guard ringing a bell.

Complete Story Mission: Welcome Home.

Complete a level without shooting.

Complete a level without visiting siderooms.

Escape from the guest house.

Obtain something by closely examining an item.

Kill 50 enemies using the Chainsaw

Kill 5 enemies with one shot while in the AC-130 gunship.

Kill an enemy while blinded by a flashbang in the single player campaign.

Protect 'War Pig', the Abrams tank.

Save Pvt. Roycewicz on the stairs.