TechLookz

Gamerscore points:
Accomplish the indicated task to get the corresponding number of Gamerscore points:

Complete the training mission (25 points): Successfully complete the training mission.
Heavyweight in multiplayer (20 points): Get a total of 10,000 kills in multiplayer.
Deadly in multiplayer (20 points): Get 4 kills in 4 seconds or less in multiplayer.
Unyielding in multiplayer (32 points): Get 30 kills before being killed in multiplayer.
Falcon in multiplayer (16 points): Shoot down 100 helicopters in multiplayer.
Sniper in multiplayer (36 points): Get a career total of 500 head shots in multiplayer.
Committed in multiplayer (28 points): Play for 8 hours straight in multiplayer.
Master of Ceremonies (24 points): Host at least 1000 matches.
Coop 1-1 (8 points): Win missions in the cooperative campaign.
Coop 1-2: Win missions in the cooperative campaign.
Coop 1-3 (8 points): Win missions in the cooperative campaign.
Coop 1-4 (8 points): Win missions in the cooperative campaign.
World Champion in multiplayer (40 points): Climb to the top of the universal leaderboard.
Solo champion in multiplayer (32 points): Climb to the top of the solo leaderboard.
Team champion in multiplayer (32 points): Climb to the top of the team leaderboard.
Reach Ramirez under normal (25 points): Reach Captain Ramirez's position.
Secure Ballantine under normal (25 points): Secure the U.S. President.
Escort Ruiz-Pena under normal (25 points): Escort the Mexican President to U.S. Embassy.
Neutralize rebel outpost (norm.) (25 points): Neutralize a rebel outpost blocking the highway.
Eliminate defenses under normal (25 points): Eliminate Chapultepek castle defenses.
Secure U.S. tanks under normal (25 points): Take control of 50 U.S. tanks stolen by rebels.
Protect U.S. President under normal (25 points): Locate and protect U.S. President.
Reach the Football under normal (25 points): Reach the Football's location.
Clear the way under normal (25 points): Clear access to rebel HQ.
Capture Ontiveros under normal (25 points): Capture General Ontiveros alive.
Locate the Football under normal (25 points): Take the Football back from Carlos Ontiveros.
Reach Ramirez under hard (25 points): Reach Captain Ramirez's position.
Secure Ballantine under hard (25 points): Secure the U.S. President.
Escort Ruiz-Pena under hard (25 points): Escort the Mexican President to U.S. Embassy.
Neutralize rebel outpost under hard (25 points): Neutralize a rebel outpost blocking the highway.
Eliminate defenses under hard (25 points): Eliminate Chapultepek castle defenses.
Secure U.S. tanks under hard (25 points): Take control of 50 U.S. tanks stolen by rebels.
Protect U.S. President under hard (25 points): Locate and protect the U.S. President.
Reach the Football under hard (25 points): Reach the Football's location.
Clear the way under hard (25 points): Clear access to rebel HQ.
Capture Ontiveros under hard (25 points): Capture General Ontiveros alive.
Locate the Football under hard (25 points): Take the Football back from Carlos Ontiveros.
Perfect Chapter 1 in multiplayer (40 points): Successfully complete all primary and secondary objectives in Chapter 1.

Invincible team:
While playing a game press Start to pause the game and hold LT + RT + Back while pressing X, X, Y, RB, Y, LB. If you did this correctly you will hear a sound.

Lase the power generator:
During the mission you will be given an objective to lase the power generator. To do this, you must press Up on the d-pad until you see the Apache helicopter appear in NORCAM on the top left of the screen, target the power generator with your gun until it lights up in yellow, and press Up on the d-pad again to have the Apache blow up the generator.

Regain 100% health:
While playing a game press Start to pause the game and hold LT + RT + Back while pressing LB, LB, RB, X, RB, Y. If you did this correctly you will hear a sound.

Scott Mitchell invincibility:
While playing a game press Start to pause the game and hold LT + RT + Back while pressing Y, Y, X, RB, X, LB. If you did this correctly you will hear a sound.

Unlimited ammo:
While playing a game press Start to pause the game and hold LT + RT + Back while pressing RB, RB, LB, X, LB, Y. If you did this correctly you will hear a sound.