Die.

Die 50 Times.

Die 100 Times.

Survive with no arms or legs.

Complete 3 missions for H.O.B.O.

Complete 8 missions for H.O.B.O.

Complete 25 missions for H.O.B.O.

Murder an ally in H.O.B.O. Command (don't worry, they grow back).

Move somewhere really fast.

Replace your brain with somebody else's.

Kill 10 enemies with the pistol.

Discover the Covert Operative.

Die during an evac back to H.Q.

Kill 30 enemies with fire.

Kill 50 enemies with the flamethrower.

Kill 10 enemies with bricks.