Enter the following at the Cheats menu:

Stiffcomp

Neverboard

Juice4me

Rollitall

WeEatDirt

Unlock everything

Unlock all boards for selected skater

Max stats

FMV sequences

All created skaters

Unlock Neversoft team Members:
Enter the following as Created Skater Names.

Aaron Skillman

Alan Flores

Andrew Rausch

Andy Nelson

Brian Jennings

Captain Jennings

Chad Findley

Chris Glenn

Chris Rausch

Chris Ward

Connor Jewett

Darren Thorne

Dave Cowling

Dave Stohl

Edwin Fong

Gary Jesdanun

Henry Ji

James Rausch

Jason Uyeda

Jeremy Anderson

Joel Jewett

Johnny Ow

Junki Saita

Kevin Mulhall

Lisa Davies

Mark Scott

Matthew Day

Mick West

Mike Ward

Nicole Willick

Noel Hines

Nolan Nelson

Paul Robinson

Pete Day

Rachael Day

Ralph D'Amato

Ryan McMahon

Sandy Jewett

Scott Pease

Steve Ganem

Steven Rausch

Trey Smith

William Pease

Unlock Wolverine:
Beat all 54 goals and get gold on all the competitions with 4 different skaters.