Infiltrate the snowy mountain side base.

Kill 2 enemies with a single bullet in Single Player or Special Ops.

Defeat 50 enemies with hand-to-hand combat

Defeat 20 enemies with gunfire by aiming while hanging

Defeat three enemies with one explosion

Defeat 20 enemies with hand-to-hand combat

Face off against Zack in 'Rush Hour'

Perform a Free-Fall Transition

Make it into the Top 100000 on SP Leaderboards - Either Campaign

Earn a Gold Medal - Either Campaign

Earn a Silver Medal - Either Campaign

Unlock a New Zone - Either Campaign