Gunmetal - Platform: XBox

Unlock entire game 
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enter the following sequence at the mission select screen: 
LTHUMBSTICK BUTTON, BLACK, RTRIGGER, RTHUMBSTICK BUTTON, 
WHITE, LTRIGGER 

Switch front-end music
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enter the following sequence anywhere in the front-end: 
LTHUMBSTICK BUTTON, LTHUMBSTICK BUTTON, RTHUMBSTICK BUTTON, 
RTHUMBSTICK BUTTON, LTRIGGER, RTRIGGER 

Spoof Mission Briefing
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enter the following at the armoury screen before launching missions 
1, 3, 6, 8, 9 & 14 only). 
LTRIGGER, LTRIGGER, RTRIGGER, RTRIGGER, LTHUMBSTICK BUTTON, RTHUMBSTICK 
BUTTON