XBox Solution

Unlock Everything:

Enter the following code at the mission select screen:
Left-stick button, Black, R trigger, Right-stick button, White, L trigger

Change Front-End Music:

Left-stick button, Left-stick button, Right-stick button, Right-stick button, L trigger, R trigger

Spoof Mission Briefing:

Enter at the armory screen – only works on missions 1, 3, 6, 8, 9, and 14.
L trigger, L trigger, R trigger, R trigger, Left-stick button, Right-stick button

Complete current mission:

Enter during gameplay without pausing the game:
Left-stick button, white, white, back, Right-stick button, white

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