Unlock USA Extreme bike 
     Go  to the "Game Mode" screen, after press Right, Up, B, B, A, B,
Up, B, B, A

Unlock 50th Anniversary bike
     In  the  "Season" option, set season to 2005. Play with Valentino
Rossi and win a Quick Race at Valencia

Unlock 50th Anniversary bike
     In  the  "Season" option, set season to 2005. Play with Valentino
Rossi and win a Quick Race at Laguna

Unlock Quick Race Extreme mode and tracks 
     Play with Valentino Rossi and win a Quick Race in GP mode

Unlock extreme mode 600cc-1200cc 
     Repeat all the 17 tracks

Complete the following tasks to get gamerscore points:

Extreme Bike Collector (50 pts.)       Buy all extreme bikes 
Accredited (100 pts.)                  All rider credits awarded 
Challenge Expert  (30 pts.)            Finish 50 challenges 
Challenge Master  (60 pts.)            Finish all challenges 
Unlock Extreme Mode Champion (10 pts.) Won any extreme mode championship
Unlock GP Champion (60 pts.)           Won career mode grand prix season 
                                       on champion diff.
Unlock GP Legend (100 pts.)            Won a career mode grand prix season 
                                       on legend dif.
Unlock GP Professional (30 pts.)       Won a career mode grand prix season 
                                       on pro diff.
Unlock GP Rookie (10 pts.)             Won a career mode grand prix season 
                                       on rookie diff.

Unlock Extreme 600 - Legend (30 pts.)  Won a career mode extreme 600 season 
                                       on  legend diff.

Unlock Extreme 1000 - Legend (60 pts.) Won a career mode extreme 1000 season 
                                       on legend difficulty 

Unlock Extreme 1200 - Champion (50 pts.)  Won a career mode extreme 
                                          1200 season on champion diff.

Unlock Extreme 1200 - Legend (75 pts.)    Won a career mode extreme 
                                          1200 season on legend diff.

Unlock Extreme 1200 - Professional (25 pts.)  Won a career mode extreme 
                                              1200 season on pro diff.