Fight Club

Fight as Abe Lincoln:
Successfully complete the game in arcade mode with all characters.

Fight as Fred Durst:
Successfully complete the game in story mode.

Fight as Halo:
Successfully complete the game in arcade mode with Fred Durst to unlock Halo the bartender.

Fight as Richard Chesler:
Get nine survival mode wins.
Mercutio.

Movies:
Successfully complete the game in arcade mode with various characters to unlock movies.

Alternate costumes:
Press X when choosing a fighter at the selection screen.
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Hint: Break bones:
Get your opponent's life to a certain point (red zone). Then, press Down + A + X or Up + X + Y. This is useful when your goal is to break that person's arm.
Plaskon.

Hint: Break back:
In order to break your opponent's leg, he must be one hit away from defeat. Then, press Right + B + Y.
Azaghal and Mercutio.

Hint: Kick head:
After you defeat an opponent, hold L + R and press X, Y, X, Y to kick them in the head while they are down. Note: This will not work if the opponent taps out.
Jvr3rd.

Hint: Biggest combo:
Press X(2), Y, B, A(3) for the Corporate Punisher 2 attack.
Elliot Tinguely.

Hint: Easy wins:
As soon as your opponent gets back on his feet, execute a punch combo. You only have a small amount of time to hit him when he is not blocking you. Kicks do not work as well, as they usually duck faster and can sweep you on the ground. A good combo would be X, Y, X, Y.
Azaghal.

Hint: Faster CDP gain:
Survival mode allows you to gain 1,000 CDP points on your first victory, and it increases by 250 points with each win. However, the more fights you win, the tougher your enemy becomes.
Azaghal.

Hint: Opponent fighting styles:
A martial artist is a fast punch and kicker. Grapplers do heavy damage with grapples, but are very slow at punching/kicking. The Brawler is a mix of these two and has respective differences, such as heavy punch/kicks but slow punch/kicks, etc.
Azaghal and Mercutio.

Hint: Alternate victory pose:
Immediately after you fight Lou in arcade mode, your character does a little victory pose. However, when you defeat him using a martial arts fighter (for example, Tyler), you will gather electricity in your hands. As your character is finishing it off, he generates electricity in the palms of his hands.
Erik Mansfield.