Enter the following codes at the cheat menu:
Unlock All Career Mode Levels for Your Skater: STIFFCOMP
Unlock All Boards for Your Skater: NEVERBOARD
Unlock All Movies: ROLLIT
Unlock All skaters: TeamFreak
Unlock All Stat Points for Current Skater: JUICE4ME
Unlock CAS Skaters: Weeatdirt
Pro-Bails Video 2: Complete all 3 competitions in THPS3 with a gold metal in each
Unlock Oil Rig: Get 100% in all stages except Cruise Ship with any skater
Unlock X-Ray: Complete all 54 objectives and get 3 gold medals with any 2 skaters
Unlock Darth Maul: Complete all 54 objectives and get 3 gold medals with any 3 skaters
Unlock Wolverine: Complete all 54 objectives and get 3 golds with any 4 skaters
Unlock Warehouse Stage: Complete all 54 objectives and get 3 golds with any 5 skaters
Unlock Officer Dick: Complete all 54 objectives and get 3 golds with any 6 skaters
Unlock Private Carrera: Complete all 54 objectives and get 3 golds with any 7 skaters
Unlock Burnside: Complete all 54 objectives and get 3 gold medals with any 8 skaters
Unlock Kelly Slater: Complete all 54 objectives and get 3 gold medals with any 9 skaters
Unlock Roswell: Complete all 54 objectives and get 3 gold medals with any 10 skaters
Unlock Ollie The Bum: Complete all 54 objectives and get 3 golds with any 9 skaters
Unlock Demoness: Complete all 54 objectives and get 3 gold medals with any 11 skaters.