Successfully complete the indicated task to unlock the corresponding 
skin for Crash:

Battler: Jack 35 Battlers. 
Bratgirl: Defeat 130 Brat Girls. 
Doom Monkey: Defeat 500 Doom Monkeys. 
EE-Lectric: Jack 50 EE-Lectrics. 
Goar: Jack 30 Goars. 
Halloween: Successfully complete 50% of the game. 
Koo-ala: Defeat 150 Koo-Alas. 
Magmadon: Jack 50 Magmadons. 
Ratnician: Defeat 200 Ratnicians. 
Rhinoroller: Jack 30 Rhinorollers. 
Scorporilla: Jack 15 Scorporillas. 
Shellephant: Jack 15 Shellephants. 
Sludge: Jack 50 Sludges. 
Snipe: Jack 50 Snipes. 
Spike: Jack 50 Spikes. 
Stench: Jack 50 Stenches. 
Valentine: Collect all Gold Idols. 
Voodoo Bunnie: Defeat 200 Voodoo Bunnies.