Rainbow Six: Vegas 2 - MTAR21 assault rifle

M468 assault rifle:
Hold RB and press Up, Y, Down, A, Left, X, Right, B, Left, Left, Right, X at the title screen.

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

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

Laser bullets:
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, Left Analog-stick, press A, click Right Analog-stick2, press B, click Left Analog-stick, Left Analog-stick, press X, click Right Analog-stick, Right Analog-stick, 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.

Big heads:
Pause the game play during an offline single player game, the hold RB and press B, X, A, Y, click Left Analog-stick, press Y, A, X, B, click Right Analog-stick.

One hit kills:
Pause the game play during an offline single player game, then hold RB and press Left Analog-stick, Right Analog-stick, Left Analog-stick, Right Analog-stick, press A, B, click Left Analog-stick, Right Analog-stick, Left Analog-stick, Right Analog-stick, press X, Y.

Unlock Comcast Even Map:
Go to the Main Menu. Select Extras. Select Comcast Gift. Enter 'Comcast Faster' to unlock the multi-player map Comcast Event.

Achievements:
That Wasn't So Hard
Reward: 5 Points
Objective: Complete a scene as Bishop's teammate, Knight, in co-op Story mode at any difficulty.

Completed Pic des Pyrnes
Reward: 25 Points
Objective: Complete Pic des Pyrnes in Story Mode at any difficulty.

Completed Old Vegas
Reward: 25 Points
Objective: Complete Old Vegas in Story Mode at any difficulty.

Completed Recreational Center
Reward: 25 Points
Objective: Complete Recreational Center in Story Mode at any difficulty.

Completed Convention Center
Reward: 25 Points
Objective: Complete Convention Center in Story Mode at any difficulty.

Completed Theater
Reward: 25 Points
Objective: Complete Theater in Story Mode at any difficulty.

Completed Nevada Desert
Reward: 25 Points
Objective: Complete Nevada Desert in Story Mode at any difficulty.

Completed Estate
Reward: 25 Points
Objective: Complete Estate in Story Mode at any difficulty.

Freedom Shall Prevail
Reward: 75 Points
Objective: Complete the Story Mode on Realistic difficulty.

I Like the Sound it Makes
Reward: 25 Points
Objective: Kill 150 terrorists with a Shotgun.

Weapon Collector
Reward: 30 Points
Objective: Unlock every weapon in the game.

Rappel King
Reward: 20 Points
Objective: Kill 25 enemies while suspended from a rope.

My Name is Sam
Reward: 25 Points
Objective: Neutralize 5 terrorists in a row by performing headshots using a Sound Suppressor.

Gimme a High Five
Reward: 10 Points
Objective: Complete 5 scenes as Bishop's teammate, Knight, in co-op Story mode at any difficulty.

Here's for a Wicked Five
Reward: 20 Points
Objective: Complete 10 scenes as Bishop's teammate, Knight, in co-op Story mode at any difficulty.

Novice Hunter
Reward: 5 Points
Objective: Complete your first Terrorist Hunt mission at any difficulty.

Veteran Hunter
Reward: 20 Points
Objective: Complete 5 Terrorist Hunt missions at any difficulty.

Extreme Hunter
Reward: 50 Points
Objective: Complete all Terrorist Hunt missions on Realistic difficulty.

Bring it on
Reward: 10 Points
Objective: Complete a Terrorist Hunt mission at the hardest difficulty.

Haute Couture
Reward: 10 Points
Objective: Create your own custom camouflage.

True Identity
Reward: 20 Points
Objective: Use the Xbox Live Vision to create a character with your appearance.

Multiplayer:

Natural Leader
Reward: 15 Points
Objective: Lead your team to Victory 20 times in Team Leader with at least 6 players present.

Pointman
Reward: 10 Points
Objective: Kill 50 enemies in multiplayer adversarial with at least 6 players present.

Triggerman
Reward: 20 Points
Objective: Kill 150 enemies in multiplayer adversarial with at least 6 players present.

Gun Shark
Reward: 25 Points
Objective: Kill 300 enemies in multiplayer adversarial with at least 6 players present.

Eye of the Sniper
Reward: 30 Points
Objective: Kill 500 enemies in multiplayer adversarial with at least 6 players present.

Don't Mess With Me
Reward: 45 Points
Objective: Kill 1000 enemies in multiplayer adversarial with at least 6 players present.

Ace of Spades
Reward: 15 Points
Objective: Perform 5 consecutive kills without dying in an adversarial match without respawns

The Ace Always Wins
Reward: 5 Points
Objective: Win your first ranked match online.

Double or Nothin'
Reward: 10 Points
Objective: Win 2 ranked matches in a row.

Three of a Kind
Reward: 15 Points
Objective: Win 3 consecutive ranked matches in a row.

Royal Flush
Reward: 30 Points
Objective: Win 100 adversarial matches with at least 6 players present.

The House Always Wins
Reward: 15 Points
Objective: Host and win 10 matches with at least 6 players present.

My Hero
Reward: 10 Points
Objective: Rescue both Hostages 10 times in Attack & Defend with at least 6 players present.

Kamikaze
Reward: 10 Points
Objective: Plant and detonate 10 bombs in Attack & Defend with at least 6 players present.

Demo Expert
Reward: 10 Points
Objective: Defuse 10 bombs in Attack & Defend with at least 6 players present.

Covert Ops Specialist
Reward: 10 Points
Objective: Extract the intel item 10 times with at least 6 players present

Cluster Bomb
Reward: 10 Points
Objective: Kill 3 enemies at once using explosives with at least 6 players present

Sidearm Frenzy
Reward: 25 Points
Objective: Kill 100 enemies using a Pistol with at least 6 players present.

Come Closer
Reward: 20 Points
Objective: Kill 100 enemies using a shotgun with at least 6 players present

Spray and Pray
Reward: 15 Points
Objective: Kill 100 enemies using a Sub-Machine Gun with at least 6 players present.

Short Controlled Bursts
Reward: 15 Points
Objective: Kill 100 enemies using an Assault Rifle with at least 6 players present.

One Shot, One Kill
Reward: 30 Points
Objective: Kill 100 enemies using a Sniper Rifle with at least 6 players present.

Machine Gunner
Reward: 20 Points
Objective: Kill 100 enemies using a Light Machine Gun with at least 6 players present.

Private First Class
Reward: 10 Points
Objective: Achieve the rank of Private First Class.

Officer
Reward: 30 Points
Objective: Achieve the rank of Officer.

Elite
Reward: 50 Points
Objective: Achieve the rank of Elite.