How to Unlock All Characters:
Zack, Dexter, and Punk- Starter Characters
Kevin, Derek, and Bruce- Complete the Campain "Town Tussle"
Umbungo and Monkey- Complete the Campain "Tribal Trouble"
Douglas and Fox- Complete the Campain "Farmageddon"
Zombie- Complete the Campain "Grave Situation"
Gladiator, Tiger, and Lion- Complete the Campain "Chaosseum"
Guardsman and Knight- Complete the Campain "Castle Hassle"
Alien- Complete the Campain "Spaced Out"
Cap'n Black- Complete the Campain "Shore Booty"
Vladimir and Spectre- Complete the Campain "Mansion Melee"
Scientist and Hybrid- Complete the Campain "Technichaos"
Carbonite- Complete the Campain "Lava Palaver"
Builder- Complete the Campain "Scaffold Scuffle"
Eskimo Joe and Polar Bear- Complete the Campain "Snow Brawl"
Robot- Complete the Campain "Crate Factory"
Minigon and Hypergon- Complete the Campain "Chaos Tower"
Dad 'n' Me- Get the Achievment "Kapow"
Futility- Get the Achievment "Zero Gravity"
Weebl- Get the Achievment "Kill It With Fire"
Ragin' Brain- Get the Achievment "Architect"
Salad Fingers- Get the Achievment "Pacifist"
Bitey- Get the Achievment "Up Up And Away"
Tank Man- Get the Achievment "Veteran"
Gorilli- Get the Achievment "Take the Plunge"
Mechalo- Get the Achievment "Survivor"
Hominid- Get the Achievment "4 On The Floor"
Awesome Face- Get the Achievment "Lift Off"
Madness- Get the Achievment "Fantastic 5"
Vortigon- Complete ALL Achievments