Moto GP - Ultimate Racing Technology 2006 - Platform: Xbox 360

USA Extreme bike:
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At the "Game Mode" screen, press Right, Up, B(2), A, B, Up, B(2), A to unlock 
the USA Extreme bike. 

50th Anniversary bike (yellow/white with black bar stripe):
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Set your season to 2005 under the "Season" option. Then, win a Quick Race with 
Valentino Rossi at Laguna Seca to unlock the 50th Anniversary bike (yellow/white 
with black bar stripe). 

50th Anniversary bike (red/white/green):
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Set your season to 2005 under the "Season" option. Then, win a Quick Race with 
Valentino Rossi at Valencia to unlock the 50th Anniversary bike 
(red/white/green). 

Quick Race Extreme mode and tracks:
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Win a Quick Race in GP mode with Valentino Rossi to unlock Quick Race Extreme 
mode and tracks. 

Extreme mode 600cc-1200cc:
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Repeat all seventeen tracks to unlock more Extreme mode tracks. 

Unlock USA Extreme Bike:
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On the GAME MODE screen, enter the following code:

Code       - Effect
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RUBBABUBBA - Unlocks USA Extreme Bike

Note:
A - A button
B - B button
R - Right on D-pad
U - Up on D-pad 

Unlock all achievements:
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Go to the Achievements menu en hold RB + LB en then push A, B, L, L, Y, Y. 

Quick Race Extreme mode and tracks:
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As Valentino Rossi, win Quick Race in GP mode.