Figure out a way to defeat each opponent. Use your chosen freak's strengths to land a single hit and win the round. Win 2 out of 3 rounds for the match.
3 medals (pending approval) and 3 scoreboards for completing the game with each of the available characters. There is also one minor unlockable that I only really included to test that the damn thing would save (it bloody doesn't). Complete the game with anyone to get it.