Gears of War 3 Cheats

Look at That, Instant Summer. (10): Story Progression in Act 5 Chapter 2 (Standard or Arcade).
Lost Your Good Driver Discount (10): Story Progression in Act 3 Chapter 3 (Standard or Arcade).
Marcus, It's Your Father (5): Story Progression in Prologue (Standard or Arcade).
My Fellow Gears (50): Complete all Campaign Acts in Co-op (any difficulty, Standard or Arcade).
My Turf! Cougars Territory! (10): Story Progression in Act 1 Chapter 5 (Standard or Arcade).
Oh Yeah, It's Pirate Time (10): Story Progression in Act 2 Chapter 5 (Standard or Arcade).
Ok. Faith. Yeah. Got It. (10): Story Progression in Act 5 Chapter 5 (Standard or Arcade).
Okay, Now We Find Hoffman (10): Story Progression in Act 2 Chapter 1 (Standard or Arcade).
Pack Rat (10): Recover 20 Campaign Collectibles (any difficulty, Standard or Arcade).
Putting it Scientifically… (10): Story Progression in Act 1 Chapter 6 (Standard or Arcade).
Ready for More (50): Complete all campaign Acts on Casual or Normal Difficulty (Standard or Arcade).
Remember the Fallen (15): Recover all 15 COG Tags during the Campaign (any difficulty, Standard or Arcade).
Respect for the Dead (5): Your respect for the dead earned you access to Griffin's special weapons stash.
Seriously 3.0 (100): Reach level 100 and earn every Onyx medal.
Socialite (70): Earn the Onyx "War Supporter" medal.
Swimmin' in Glowie Gravy (10): Story Progression in Act 1 Chapter 2 (Standard or Arcade).
Thanks For Flying GasBag Airways (10): Story Progression in Act 2 Chapter 7 (Standard or Arcade).
That's Just Crazy (75): Complete all campaign Acts on Insane Difficulty (Standard or Arcade).
The Versus Sampler Platter (10): Complete one match of all six Versus game modes (Standard or Casual).
Think You Can Handle That? (10): Story Progression in Act 4 Chapter 3 (Standard or Arcade).
Wait, What Time is it? (10): Earn the maximum Consecutive Match Bonus in Versus multiplayer (Standard or Casual).
Was it Good For You? (10): Story Progression in Act 3 Chapter 2 (Standard or Arcade).
We Few, We Happy Few... (50): Complete all Campaign Acts in 4 player Co-op (any difficulty, Standard or Arcade).
We Struck Gold, Son! (10): Story Progression in Act 1 Chapter 3 (Standard or Arcade).
Welcome To -redacted- (10): Story Progression in Act 4 Chapter 6 (Standard or Arcade).
Welcome to Arcade Mode (10): Complete 5 Arcade Campaign chapters in co-op (any difficulty).
Welcome to Beast Mode (10): Survive all 12 waves of Beast mode (any difficulty, any map).
Welcome to Horde Mode (10): Survive the first 10 waves of Horde mode (any difficulty, any map).
Welcome to the Big Leagues (0): Demonstrate your skill in Casual Versus multiplayer.
Welcome to Versus (10): Kill 10 enemies in Team Deathmatch (Standard or Casual).
Wreaking Locust Vengence (10): Get a kill with every Locust monster in Beast mode (any difficulty).
You're Dead! Now Stay Dead! (10): Story Progression in Act 5 Chapter 6 (Standard or Arcade).

Horde Command Pack Achievements
Complete each achievement to receive the allotted gamerscore.
It's Hammer Time! (50): Achieve Level 4 in Horde Command Center fortifications.
Kill Locust (Like a Boss) (100): Defeat a Boss Wave as 5 Onyx Guards (Hardcore difficulty).
Places to See, People to Destroy (25): Host a private Beast Match with a party of 5 players on any Horde Command Pack map (any difficulty).
The Host with the Most (25): Host a private Horde Match with a party of 5 players on any Horde Command Pack map (any difficulty).
What Does This Button Do? (50): Get 500 Silverback rocket kills in Horde (any map, any difficulty).

RAAM's Shadow Achievements
Death from Above (15): Showed 50 Locusts the meaning of sky-fire with HOD Command Center.
Finger of Doom (15): As RAAM, ripped 50 Gears to shreds with your Kryll.
Foreshadowing (25): As RAAM, made sure Minh never forgets that day outside the House of Sovereigns.
Ghosts from the Past (15): Honored the memory of Zeta Squad in 10 matches of Versus.
Help From My Friends (25): Completed "RAAM's Shadow" in 4 player co-op.
I'm Rubber, You're Glue (15): Used the Mauler shield to kill 10 Gears that had the temerity to fire upon you and your General.
Some Friendly Competition (25): Completed "RAAM's Shadow" in Arcade Campaign.
Unarmed and Dangerous (15): Ignored all Loader safety guidelines and killed 10 Locusts.
Welcome To Zeta (25): Completed "RAAM's Shadow" in Standard Campaign.
Zeta Team, Go! (75): Defeated the first 10 waves of Horde with every member of Zeta in your party.

Fenix Rising Map Pack Achievements
Again! (50): Achieve level 100 a second time and choose to re-up for another tour.
Come to Poppa! (15): Win a Versus multiplayer match as a team of five Recruit Claytons (any mode).
Defending the Past (25): Complete all 50 waves of Horde on any of the Fenix Rising maps.
I've Done it All! (75): Earn at least one of each of the original 132 combat ribbons.
Locust, Forever! (15): Win a Versus multiplayer match as a team of five Savage Marauders (any mode).
Now They Begin to Understand (20): Complete all 12 waves of Beast on all Fenix Rising maps.
Time to Re-up! (50): Achieve level 100 and choose to re-up for another tour of duty.

DLC: Forces of Nature
Complete each achievement to receive the allotted gamerscore.
Elemental (25): Get 25 kills with any of the hidden elementally charged Cleavers in Horde.
Force Multiplayer (25): Win a match of Guardian on all Forces of Nature maps.
Force Multiplier (50): Kill a Lambent Berserker with a team comprised of 5 Forces of Nature characters in Horde.
Horde Natural (20): Complete 20 consecutive waves of Horde on any Forces of Nature map without going down or dying.
Hunter Gatherer (20): Bag and Tag 20 opponents while playing as the Savage Hunter in Versus multiplayer (any mode).
I've Got This! (20): Kill 10 opponents as the leader in a round of Guardian on a Forces of Nature map.
Natural Selection (20): Complete all 12 waves of Beast on all Forces of Nature maps.
Stock Piled (20): Achieve the maximum level on all fortifications in Horde mode.
Unstoppable Force (25): Complete all 50 waves of Horde on any of the Forces of Nature maps.
Witty Repairtee (25): Build or repair 50,000 worth of fortifications as Mechanic Baird LE.

Unlockable COG Characters
Aaron Griffin: Receive the Big Money Onyx Medal or "Like" the Gears of War 3 Facebook page to get an unlock code.
Adam Fenix: Preorder code with purchase of the Gears of War 3 Limited or Epic Edition.
Anthony Carmine: Reach Level 75.
Benjamin Carmine: Reach Level 34.
Chairman Prescott: Receive the silver Allfathers medal.
Civilian Anya: Reach Level 45.
Classic Baird: Reach Level 30.
Classic Cole: Reach Level 23.
Classic Dom: Reach Level 17.
Classic Marcus: Receive the silver Veteran medal.
Clayton Carmine: Reach Level 14.
COG Gear: Reach Level 2.
Cole Train: Play the multiplayer beta.
Colonel Hoffman: Reach Level 50.
Commando Dom: Preorder code from GameStop.
Dizzy Wallin: Reach Level 7.
Golden Gear: Receive the bronze War Supporter medal.
Jace Stratton: Reach Level 10.
Mechanic Baird: Preorder code from Best Buy.
Samantha Byrne: Reach Level 4.
Superstar Cole: Receive the gold MVP medal.
Unarmored Marcus: Finish the campaign on any difficulty level.

Unlockable Mutators
Mutators are special option allowing certain changes to be made to the game as you play. To unlock these, just complete each task below to the corresponding Mutators

Big Explosions: In any mode, unlock the Hail Mary ribbon 100 times.
Big Head: In Horde Mode, unlock the Gold Horder medal.
Comet: In Versus Mode, unlock the Gold Shock Trooper medal.
Enemy Regeneration: In Arcade Mode, unlock the Silver Afficianado medal.
Flower Blood: In Arcade Mode, unlock the Silver King of Cog medal.
Friendly Fire: In Co-op Campaign, complete the co-op campaign with four players.
Infinite Ammo: In Horde Mode, unlock the Combat Engineer ribbon 100 times.
Instagib Melee: In Beast Mode, play as a Wretch and score 200 kills.
Laugh Track: Unlock the Bronze Tour of Duty, For the Horde, I'm a Beast, and Warmonger medals.
Must Active Reload: Unlock the Silver Active Reloader medal.
Pinata: In Beast Mode, unlock the Gold Investor medal.
Super Reload: In Versus Mode, unlock the Bronze Master at Arms medal.
Vampire: In Versus Mode, unlock the Executioner ribbon 100 times.

CluckShot
A Boom shot that fires exploding Chickens . 1. To start off, you're going to need to play through Act 4 Chapter 1 on Insane. So this means you either have to beat the game once already, or you'll need to play coop with someone who has beaten the game once. 2. Go through Act 1 without touching any of the ash bodies. Doing so will get you the secret "Respect For the Dead" Achievement once you arrive at Griffin's Hideout and enter his secret weapon stash. More importantly though, it will give you access to this little chicken to the right with a pirate hat. Press X to interact with the chicken to cause it to explode, as if to officially kick off our easter egg hunt. 3. Now, play through Act 4 Chapter 2 like normal. Just make sure that you find two special ammo boxes that fall off a cliff as you approach them. The first one can be found at the start of the act on top of a car. The second can be found at the end of a railroad track in the underground section where you're attacked by Polyps. 4. Now continue playing as normal until you reach Act 4 Chapter 3. After you head past the lift and go through the barbed wire, you'll come to a fight with a bunch of Formers. Make sure to take them all out and then look for a stack of objects with another ammo box on top. Kick the stack to cause the ammo box to fall. Wait for a second and you'll spot your "air support." One specially made Cluckshot for every member of your party!

Mad World played during Gridlock (multiplayer)
To do this is simple, play a match with at least 2 round wins required to finish a match and go a whole round without destroying any of the "ash people" within the multiplayer map. (This includes everyone playing, not just you, noboby can destroy a ash person) The next round, a instumental piano version of "Mad World" will play for about 50 seconds at the beginning of the round. Enjoy the music!

Giant Golden Chicken
On "Chapter 1 - Act " you will reach four giant tubes just after raising the landing pad on top deck. After you eliminate all the enemies around the area, whatever player is playing as Marcus will need to step in front of one of the pipe openings. Stare down the opening until Marcus says "hello", then repeat the same thing for the last three tubes. After saying "hello" down all four tubes, a small, harmless chicken will pop out. If you deal some significant damage to the little chicken, the chicken will then become a giant, golden, enraged, fire-breathing chicken (a.k.a. Lambent Chicken). If you deal more significant damage to the Lambent Chicken, it will then blow up into confetti and ending with a funny quote by Marcus.