Unlock the following characters by performing the corresponding tasks:

CHARACTER - HOW TO UNLOCK
Boogie - Buy everything in survival mode
Bubbles - Survive 15 consecutive waves
Cesar - Kill an enemy with a sink
Chop Chop - Perform 60 pistol counter kills
Classic Shank - Kill a goon by throwing a bomber
Defender - Perform 100 turret kills
Falcone - Complete Campaign on hard
Hobo - Defeat all waves of a survival map
Horror - Reach the zombie wave in each survival map
Junior - Perform 50 fire trap kills
Kat - Perform 100 grenade kills
Rex - Complete Campaign on normal
Rin - Perform 20 bat counter kills
Sunshine - Purchase an item in survival