In Call of the Dead, make a zombie explode using the V-R11.

Collect 25% of the prize bubbles on the story levels

Complete Mission 2 (Any Difficulty Level)

Fully Upgrade A Single Stat Of Any Weapon In Campaign Mode

Complete A Mission In Co-Op Mode (Any Difficulty Level)

Wield the pipe in single-player or co-op mode.

Ride the train for 2 kilometers.

Complete 10 of the stunts on the stunt list.

Get an 8X Multiplier

Complete a level with more than one player

Defeat Sasha.

Collect all Dead Drops in the Neon District.