Unlock all wrestlers:
At the Main Menu, press Up, Up, Down, Down, Left, Right, Left, Right, Y, Y, X.

Captain Lou Albano:
Beat Career mode with a wrestler in the "Hated" category.

David Von Erich:
Beat Career mode as Kevin Von Erich.

Dory Funk:
Beat Career mode as Terry Funk.

Fritz Von Erich:
Beat Career mode as Kerry Von Erich.

Ivan Koloff:
Win the versus tournament.

Jimmy Hart:
Beat Career mode with a wrestler in the "Loved" category.

King Kong Bundy:
Win the Southeast Territory in Career mode.

Michael Von Erich:
Beat Career mode as David Von Erich.

Mr. Fuji:
Win the Tag Belts in tournament mode.

Robert Gibson and Ricky Morton:
Win the tag tournament.

Sabu:
Beat Career mode as The Sheik.

Thanks to Revolution readesr alex nowak, Dane Meadows and marty mart!