Big Damage Mode:
Beat the Toughman Belt Tournament with the difficulty set to Hard with No Blocking on.

Big Feet Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with "Little" Spike Dudley.

Big Hands Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Super Crazy.

Big Head Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Simon Diamond.

Custom Stuff Unlocked:
First create a custom wrestler. Use your custom wrestler to complete the One Player Career Mode with the difficulty set to Hard.

Ego Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Jerry Lynn.

Fat Man Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with "Big" Sal E. Graziano.

Hangman Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Kid Kash.

Headless Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with New Jack.

Little Head Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Amish Roadkill.

Random Head Mode:
Beat the Heavyweight Belt Tournament with the difficulty set to Hard with Trainer.

Stable Stuff Unlocked:
Using a Stable, Featured, or Custom Wrestler you must finish the One Player Career Mode to unlock more Stable Stuff.