Successfully complete the game on any difficulty setting to unlock the cheat menu and Arcade mode. The cheat menu can be found at the options menu while playing the game.
Collect the indicated number of Intel Pieces (enemy laptop computers) hidden throughout the game to unlock the corresponding cheat option:
COD Noir: 2 Intel Pieces. Turns graphics black and white.
Photo-Negative: 4 Intel Pieces. Inverts the colors.
Super Contrast: 6 Intel Pieces. Increases the contrast.
Ragtime Warfare: 8 Intel Pieces. Silent Movie mode; graphics are black and white, dust and scratches fill the screen, game plays at two times the speed, and the music becomes piano music.
Cluster Bombs: 10 Intel Pieces. Frag grenades are more powerful.
A Bad Year: 15 Intel Pieces. Enemies explode into tires when shot.
Slow-Mo Ability: 20 Intel Pieces. Slow motion game play.
Infinite Ammo: 30 Intel Pieces.
The Intel Pieces can be found in the following levels. There are a total of thirty Intel Pieces.
- Level 2: 2 Intel Pieces
- Level 4: 2 Intel Pieces
- Level 5: 3 Intel Pieces
- Level 6: 2 Intel Pieces
- Level 7: 2 Intel Pieces
- Level 9: 3 Intel Pieces
- Level 10: 2 Intel Pieces
- Level 12: 2 Intel Pieces
- Level 13: 3 Intel Pieces
- Level 14: 2 Intel Pieces
- Level 16: 2 Intel Pieces
- Level 17: 1 Intel Piece
- Level 18: 2 Intel Pieces
- Level 19: 2 Intel Pieces
Successfully complete Story mode on any difficulty setting and watch the entire credits to unlock the bonus Epilogue mission.
Successfully complete Story mode on any difficulty setting to unlock the Mile High Club mission.
Reach level 55 to unlock Prestige mode. This is a multiplayer only mode that starts you back at level 1. You can repeat this ten more times.
Successfully complete the indicated task to unlock the corresponding golden weapon camouflage. Note: The golden version of the weapons does not boost any attributes and is just purely cosmetic.
- Golden Ak-47: Successfully complete all Assault Rifle challenges.
- Golden Desert Eagle: Reach level 55.
- Golden Dragonuv: Successfully complete all Sniper challenges.
- Golden M1014: Successfully complete all Shotgun challenges.
- Golden M60: Successfully complete all LMG challenges.
- Golden Mini-Uzi: Successfully complete all SMG challenges.
Reach the indicated rank in Multiplayer mode to unlock the corresponding bonus:
Private
- Level 1: All starting equipment
- Level 2: Demolitions Class Weapon Class
- Level 3: Sniper Class Weapon Class
Lance Corporal
- Level 4: Create a Class
- Level 5: Gun Challenges
- Level 6: New playlists
Corporal
- Level 7: M40 Sniper Rifle
- Level 8: Last Stand Perk Class 3
- Level 9: Boot Camp Challenges 1
Sergeant
- Level 10: M4 Carbine Assault Rifle
- Level 11: UAV Jammer Perk Class 2
- Level 12: Clan Tag
Staff Sergeant
- Level 13: Mini Uzi Submachine Gun Level 14: Bomb Squad Perk Class 1 Level 15: Boot Camp Challenges 2
Gunnery Sergeant
- Level 16: M1911 Pistol
- Level 17: Martyrdom Perk Class 2
- Level 18: Boot Camp Challenges 3
Master Sergeant
- Level 19: M60E4 Light Machine Gun
- Level 20: Sleight of Hand Perk Class 2
- Level 21: Operations Challenges
Master Gunnery Sergeant
- Level 22: Dragunov Sniper Rifle
- Level 23: Claymore Perk Class 1
- Level 24: Operations Challenges 2
2nd Lieutenant
- Level 25: G3 Assault Rifle
- Level 26: Iron Lungs Perk Class 3
- Level 27: Operations Challenges 3
1st Lieutenant
- Level 28: AK-74U Submachine Gun Level 29: Double Tab Perk Class 2 Level 30: Killer Challenges
Captain
- Level 31: M1014 Shotgun
- Level 32: Bandolier Perk Class 1
- Level 33: Killer Challenges 2
Major
- Level 34: R700 Sniper Rifle
- Level 35: Eavesdrop Perk Class 3
- Level 36: Killer Challenges 3
Lieutenant Colonel
- Level 37: G36C Assault Rifle
- Level 38: Overkill Perk Class 2
- Level 39: Killer Challenges 4
Colonel
- Level 40: P90 Submachine Gun
- Level 41: Frag x 3 Perk Class 1
- Level 42: Humiliation Challenges
Brigadier General
- Level 43: Desert Eagle Pistol
- Level 44: Dead Silence Perk Class 3
- Level 45: Humiliation Challenges 2
Major General
- Level 46: M14 Assault Rifle
- Level 47: Humiliation Challenges 3
- Level 48: Humiliation Challenges 4
Lieutenant General
- Level 49: Barret Sniper Rifle
- Level 50: Humiliation Challenges 5
- Level 51: Elite Challenges
General
- Level 52: MP44 Assault Rifle
- Level 53: Elite Challenges 2
- Level 54: Elite Challenges 3
- Level 55: Commander Prestige Mode and Golden Desert Eagle
To level up faster than usual, try to use the same gun until all the marksman and elite challenges are completed. They provide huge boosts and will quickly level you up to get new guns. However, do not use those guns yet; just keep on the challenge until it has completed. The third phase of the challenge usually ends with 1,000 experience points, which usually increases you a rank in itself. Also, do not forget about the strange challenges like jumping 15 feet and surviving or falling 30 feet to your death. To complete the fall 30 feet to your death challenge if not previously unlocked, play the "Countdown" map, and jump into one of the open missile silos. You will get instant experience points for simply dying. Also, remember to go prone and crouch to get those challenges as well.
Once you get the Red Dot Scope add-on to your weapons, use it over the ACOG scope. The red dot will not enhance or take away anything and provides a better aim point on most weapons. The ACOG scope will actually add more range to your weapon, but take away accuracy which accomplishes almost nothing, especially for snipers because it takes away range and adds nothing.
If a target is moving, make sure to lead it. If you are not making shots, try to lead your target more. Also, if you are a skilled sniper, try using the M40A3 over the M21. It has a slower reload time and rate of fire, but it has enough damage to kill a target in one shot instead of two or three. It also allows you to be less noticeable with less rounds being fired so someone else cannot follow the tracer shot back to you. A good setup for the sniper is the Claymore Perk to alert you when an enemy is trying to close in on your rear, and either the Sleight Of Hand or Stopping Power, then Iron Lungs to give you more time to line up your shots.
In the "All Ghillied Up" mission, you will come across a wild dog eating a dead soldier's remains. You will be told to leave it alone, but if you want a very difficult challenge in the game, shoot it. You will be attacked by a large pack of angry dogs.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points. Note: Enabling cheats will prevent achievements from being earned.
- Make the Jump (20 points): Infiltrate a cargo ship.
- Earn a Winged Dagger (20 points): Complete 'F.N.G.'.
- Win the War (40 points): Complete the game on any difficulty.
- Dancing in the Dark (20 points): Kill the power.
- Save the Bacon (20 points): Protect 'War Pig', the Abrams tank.
- Death From Above (20 points): Operate an AC-130 gun ship.
- Wrong Number (20 points): Find Al-Asad's safehouse.
- Piggyback Ride (20 points): Carry Cpt. MacMillian to safety.
- Desperate Measures (20 points): Corner Zakhaev's Son.
- Look Sharp (20 points): Find 15 enemy intel items.
- Eyes and Ears (20 points): Find 30 enemy intel items.
- Down Boy Down (20 points): Survive a dog attack.
- New Squadron Record (20 points): Complete the cargo ship mockup in less than 20 seconds.
- Rescue Roycewicz (20 points): Save Pvt. Roycewicz on the stairs.
- Your Show Sucks (20 points): Destroy all the TVs showing Al-Asad's speech.
- Man of the People (10 points): Save the farmer.
- Straight Flush (20 points): Kill 5 enemies with one shot while in the AC-130 gunship.
- Ghillies In The Mist (20 points): Complete 'All Ghillied Up' without alerting any enemies.
- Mile High Club (20 points): Sky dive to safety on Veteran difficulty.
- No Rest for the Weary (10 points): Stab an injured crawling enemy.
- Deep and Hard (90 points): Complete the game on Hardened or Veteran difficulty.
- The Package (40 points): Complete 'Crew Expendable' on Veteran difficulty.
- The Rescue (40 points): Complete 'Blackout' on Veteran difficulty.
- The Search (40 points): Complete 'Charlie Don't Surf' on Veteran difficulty.
- The Bog (40 points): Complete 'The Bog' and 'War Pig' on Veteran difficulty.
- The Escape (40 points): Complete 'Hunted' and 'Death From Above' on Veteran difficulty.
- The First Horseman (40 points): Complete 'Shock and Awe' on Veteran difficulty.
- The Second Horseman (40 points): Complete 'Safehouse' on Veteran difficulty.
- The Shot (40 points): Complete 'All Ghillied Up' and 'One Shot, One Kill' on Veteran difficulty.
- The Third Horseman (40 points): Complete 'Heat' and 'The Sins of the Father' on Veteran difficulty.
- The Ultimatum (40 points): Complete 'Ultimatum', 'All In', and 'No Fighting in the War Room' on Veteran difficulty.
- The Fourth Horseman (40 points): Complete 'Game Over' on Veteran difficulty.
- Daredevil (10 points): Kill an enemy while blinded by a flashbang in the single player campaign.
- Roadkill (10 points): Kill 2 enemies by blowing up a car in the single player campaign.
- Bird on the Ground (20 points): Shoot down an enemy helicopter with an RPG in the single player campaign.
- Four of a Kind (20 points): Kill 4 enemies in a row with headshots in the single player campaign.
- Three of a Kind (10 points): Kill 3 enemies in a row with your knife in the single player campaign.
