At the main screen, press X, Y, L + X, X, L, Z, R + Y. If done correctly, this will unlock all riders, bikes, tracks, track editor options, and all mini-games.
Elrod the Viking:
Win the "Lift Tower Challenge" trophy. To do this, start the Rock Ridge
freestyle course. Go left and downhill past the chairlift. Look for the stone
ramp to the right. Jump to the tower and stop on it. You must now travel up
to the higher tower riding on the cables. When you reach the other side, you
will win the trophy.
Sal the Alien:
Win the "Find Out The Truth" trophy. To do this, start the Fox Creek freestyle
course. Jump over the canyon and continue going along the side of the buildings.
You should see an opening and lots of rocks. Floor it and hit the two-sided
ramp. Make sure you are heading toward the buildings. Hit the ramp and aim your
jump so you land on the awning covering the porch of the back of the building.
Keep going and jump the next ramp, landing on the roof with the hole in it.
Go past the hole and turn around - you will see another ramp. Jump this one
to get to the highest roof. After you land on the roof, position yourself so
that when you jump the last ramp you'll land on the rock bridge. Jump down to
the ledge leading into the open mine shaft. Continue to follow this path until
you reach Sal's UFO. Continue past the ship into the next room and you will
see Sal and win the trophy.
Win the "World's Longest Jump" trophy.
Win the "Crane's Eye View" trophy.
Win the "World's Highest Jump" trophy.
Complete the "Brave The Vertical Drop" challenge.
Win the "Dominate 250cc Pro Race Season" trophy.
Win the "Dominate 125cc Pro Race Season" trophy.
Win the "Dominate 250cc Pro Freestyle Season" trophy.
Win the "Dominate 125cc Pro Freestyle Season" trophy.
Extra track editor barriers:
Win the "Dramatic Entrance" trophy.
Extra track editor movable objects:
Win the "Impossible Stoppie" trophy.
Extra track editor ramps:
Win the "Impossible Wheelie" trophy.
Extra track editor platforms and Station Z:
Win the "Cross Training" trophy.
Balloon toss mini-game:
Win the "Safety First" trophy.
Win the "Mega Stunt" trophy.
Thanks to Revolution readers Jake Bryant and Olivier!