Rainbow Six Vegas Codes -

Cheat Mode
Open the "Pause" menu while playing, hold the left shoulder button and enter the following codes (single player only):

, , , , , , , , , - All characters have big head
, , , , , , , , , , , - Increase ragdoll strength
, , , , , , , , , , , - Third person view
, , , , , , , , , , , - Change bullet tracers color
, , , , , , , , , , , - Characters are kill we only one shot

Unlock Multiplayer Tracers
You can use this to turn on tracers via xbox live so long as you are the host of the game:

Press "Start as host" then hold , x2, , x2, , x2, , x2, - Turn on multiplayer tracers Red for Red team Blue for Blue

Achievements
Do the following tasks to unlock the following achievements and their alloted gamerscore:

Basic Training (5) - Achieve the rank of Private 1st Class
Best of the Best (40) - Achieve the rank of Elite
Bomb Expert (15) - Defuse the bomb within 2 minutes in Attack & Defend
Coop Hunt Novice (10) - Complete a Cooperative T-Hunt mission with at least one other player
Coop Story Novice (10) - Complete a Cooperative Story mission with at least one other player
Dam Buster (30) - Completed Nevada Dam in single player Story Mode
Demolition Expert (20) - Kill 50 players using Explosives only
Elite Hunter (75) - Complete all maps in splitscreen T-Hunt at Realistic difficulty
Equipment Specialist (20) - Used all Gadgets at least once in single player Story
Executioner (30) - Kill 500 terrorists online or offline
Hazmat Specialist (15) - Deposit the canister and kill an enemy canister carrier in the same Retrieval match
Hell Hound (30) - Completed Dante's Casino in single player Story Mode
High Climber (30) - Completed Vertigo Spire in single player Story Mode
High Roller (30) - Completed Calypso Casino in single player Story Mode
Hostage Rescue (15) - Rescue all hostages in an Attack & Defend mission in under 5 minutes
Infiltration Specialist (15) - Recover the Intel in Attack & Defend within 2 minutes
Killer's Rampage (30) - 10 consecutive player kills without dying
Killer's Spree (20) - 5 consecutive player kills without dying
Lone Wolf (15) - Most kills in a ranked online Sharpshooter match
Marksman (10) - 100 total player kills in any adversarial mode
Master of Ceremonies (15) - Host a 16-player match
Officer (20) - Achieve the rank of Lieutenant 2nd Class
Pistoleer (25) - Kill 150 terrorists using only a Pistol
Rainbow Six Legend (100) - Complete the single player Story Mode at Realistic difficulty
Siege Specialist (15) - Leading contributor of kills for the Defenders in a winning Attack & Defend ranked match
Sniper (15) - 10 kills using a Sniper rifle in an online ranked match
Special Operations (50) - Play all maps of every Adversarial game mode
Street Cleaner (30) - Completed Downtown Vegas in single player Story Mode
Survivor (15) - Be the only remaining player in a ranked online match of Survival
Team Champion (15) - Most kills in a winning online ranked match of Team Sharpshooter
Team Survivalist (15) - Most kills in a winning online ranked match of Team Survival
Tough Hombre (30) - Completed Border Town in single player Story Mode
Tour of Duty (60) - Cooperatively complete all Terrorist Hunt missions
True Identity (30) - Used the Xbox Live Vision to create a character with your appearance
Vegas Champion (50) - Cooperatively complete the Story Mode
Veteran Hunter (50) - Complete all maps of splitscreen Terrorist Hunt on Normal difficulty

Unlockable weapons and items in multiplayer mode
EXP can be earned in both ranked or player matches:

Black Market Armor: Typhoon Recon Armor, Cyclone Combat Armor, Hurricane Assault Armor - Achieve the rank of Sergeant Major (139000 exp)
Camo 1: Desert, Urban, Russian, Guerrilla, Fall, Desert 2 - Achieve the rank of Corporal (14500 exp)
Camo 2: Flecktarn, Orange, Swedish, War2k5, Alpen, White - Achieve the rank of Sergeant First Class (56500 exp)
Camo 3: Pink, Blue, Woodland, Wasp, Sand, Crimson - Achieve the rank of 2nd Lieutenant (172000 exp)
Camo 4: Yellow Urban, Red Urban, Tiger, Rust, Urban 2, Grey - Achieve the rank of Lt. Colonel (425000 exp)
Camo 5: Custom 1, Custom 2, Custom 3 - Achieve the rank of Elite (675000 exp)
Freedom Fighter weapons: AK47, Raging Bull, SV98 - Achieve the rank of Master Sergeant (82500 exp)
Headgears 1: Tactical Helm, Balaclava - Achieve the rank of Private 1st Class (3000 exp)
Headgears 2: 3 Hole Balaclava, Baseball Cap, Breathing Mask - Achieve the rank of Staff Sergeant (38500 exp)
Headgears 3: Bonnie Hat, Beret, Tinted Goggles - Achieve the rank of First Sergeant (109500 exp)
Headgears 4: Half-Face Mask, Reinforced Helm, Tactical Goggles - Achieve the rank of 1st Lieutenant (214000 exp)
Headgears 5: Ballistic Face Mask, Riot Helm, NVGs - Achieve the rank of Colonel (535000 exp)
Merc Weapons: MG36, SPAS12, Deagle - Achieve the rank of Captain (264000 exp)
Military Armor: Vier Recon Armor, Diamondback Combat Armor, Anaconda Assault Armor - Achieve the rank of Major (330000 exp)
Rainbow Weapons: MP7A1, SIG552, USP40 - Achieve the rank of Specialist (8400 exp)
Tactical Armor: Raven Recon Armor, Vulture Combat Armor, Falcon Assault Armor - Achieve the rank of Sergeant (23500 exp)

Easter Egg: Axe
On the Fremont Street level there is a bottle of Axe on a ledge. Shoot the bottle and the roof on Fremont Street changes to an animation of a girl in a bikini with some Axe materials in neon. A movie opens showing some outtakes and pretty funny Rainbow situations/early animations.