WWF: Attitude

To unlock career mode bonuses, win 1st place on the following PPV
events and championship titles with any wrestler on any
difficulty level:

Intercontinental title
Unlocks Chyna, Jaqueline, big head mode, and gives 3 additional
attribute points in "Create Wrestler" mode.

European title
Unlocks Marc Mero, Trainer, Sable, Squeaky mode, and new
custom stuff in "Create Wrestler" mode.

WWF Heavyweight title
Unlocks Head, beep mode, and ego mode.

Royal Rumble Pay-Per-View
Unlocks Jerry Lawler and Paul Bearer.

SummerSlam Pay-Per-View
Unlocks Sgt. Slaughter and Shawn Michaels.

King of the Ring Pay-Per-View
Unlocks Kurrgan and Taka Michinoku.