Hint: Enter Third Man
When you do a tag match and choose two members of the NWO, a third member will walk with them in the entrance movie; however, you do not get to use the third member, as they don't appear during the match

Unlock Chris Benoit
Win the Heavyweight Championship in Path of Champions mode to unlock Chris Benoit.

Unlock Raven
To unlock Raven, win the Light Heavyweight Championship in Path of Champions mode.

Unlock Rhyno
To unlock Rhyno, win the Hardcore Championship in Path of Champions mode.

Unlock Rick Flair
To unlock Rick Flair, win the European Championship in Path of Champions mode.

Unlock Royal Rumble 2001 Arena
To unlock the Royal Rumble 2001 Arena, win a 30 man Royal Rumble.

Unlock SD! Classic Arena
To unlock SD! Classic Arena, win the Heavyweight belt with the Rock.

Unlock Stacy
Win the Tag Team Championship in Path of Champions mode to unlock Stacy.

Unlock Vince McMahon
To unlock Vince McMahon, win the Intercontinental Championship in Path of Champions mode.

Unlock WrestleMania X7 Arena
Play through all the default arenas to unlock the Wrestlemania X7 Arena