Rainbow Six Vegas 2 - Platform: XBox 360

MTAR-21 assault rifle:
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Hold RB and press Down(2), Up(2), X, B, X, B, Y, Up(2), Y at the 
title screen.

Stronger ragdoll effect:
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Pause game play in Single Player mode then hold LB and press 
A(2), B(2), X(2), Y(2), A, B, X, Y.

Third person view:
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Pause game play in Single Player mode then hold LB and press 
X, B, X, B, click Left Analog-stick(2), press Y, A, Y, A, click Right 
Analog-stick(2).

Laser bullets:
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Host an online match on Xbox Live. It can be any match type, as long 
as you are the host. After the game begins, press Start. Then hold LB 
and Left Analog-stick(2), press A, click Right Analog-stick(2), press 
B, click Left Analog-stick(2), press X, click Right Analog-stick(2), 
press Y. The message "GiDoeJoe Mode" will appear on everyone's screen 
to confirm correct code entry. Alpha team will shoot blue lasers and 
Bravo will shoot red lasers.

Comcast Optimized multi-player map:
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Select the "Extras" option at the main menu. Select the "Comcast Gift" 
option, then enter COMCAST FASTER as a password on the virtual keyboard 
to unlock the "Comcast Optimized" multi-player map.


Cheat:
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Submitted by: Nyanch

How to unlock Extra map go to extras go to Comcast Gift and Enter Comcast 
Faster and you got a map


God mode:
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Submitted by: jeroenk

you cant get killed 
how the code must be entered: hold LB and RB then press A.A.X.B.Y.Y.A.B.X