Unlock Andre the Giant:
In Story mode, beat the RAW or Smackdown super-star that you face after meeting Paul Heyman.

Spray the Fire Extinguisher:
Buy the Fire Extinguisher in the Shop. Then, next time you grab it, press Down + A.

Unlock Bret Hart:
Win at WMXX at the end of the season.

Play as A Train:
Acquire every title belt and create a wrestler named Baldo Bloom.

Unlock The Undertaker's Motorcycle:
Finish the RAW portion of Story mode.

Unlock "The Barber" and "The Hammer":
Win Sunday Heat's Dark and Televised matches.

Controls to your tag team partner:
During any match, press Z + Right to make your partner attack the ref; Z + Up to have him attack the legal opponent; Z + Left to attack your opponent's partner; and Z + Down to do a Tag Move.

Thanks to Revolution readers KletusCassady and Carlos Aparicio!