COD4: Modern Warfare Unlockables
Achievements
Complete each achievement to get the allotted gamerscore.
Unlockable     How to Unlock
Make the Jump (20)     Infiltrate a cargo ship
Earn a Winged Dagger (20)     Complete F.N.G.
Win the War (40)     Complete the game on any difficulty
Dancing in the Dark (20)     Kill the power
Save the Bacon (20)     Protect War Pig, the Abrams tank
Death From Above (20)     Operate an AC-130 gun ship
Wrong Number (20)     Find Al-Asad's safehouse
Piggyback Ride (20)     Carry Cpt. MacMillian to safety
Desperate Measures (20)     Corner Zakhaev's Son
Look Sharp (20)     Find 15 enemy intel items
Eyes and Ears (20)     Find 30 enemy intel items
Down Boy Down (20)     Survive a dog attack
New Squadron Record (20)     Complete the cargo ship mockup in less than 20 seconds
Rescue Roycewicz on the stairs (20)     Save Pvt. Roycewicz on the stairs
Your Show Sucks (20)     Destroy all the TVs showing Al-Asad's speech
Man of the People (10)     Save the farmer
Straight Flush (20)     Kill 5 enemies with 1 shot while in the AC-130 gunship
Ghillies in the Mist (20)     Complete 'All Ghillied Up' without alerting any enemies
Mile High Club (20)     Sky dive to safety on Veteran difficulty
No Rest for the Weary (10)     Stab an injured crawling enemy
Deep and Hard (90)     Complete the game on Hardened or Veteran difficulty
The Package (40)     Complete 'Crew Expendable' on Veteran difficulty
The Rescue (40)     Complete 'Blackout' on Veteran difficulty
The Search (40)     Complete 'Charlie Don't Surf' on Veteran difficulty
The Bog (40)     Complete 'The Bog' and 'War Pig' on Veteran difficulty
The Escape (40)     Complete 'Hunted' and 'Death From Above' on Veteran difficulty
The First Horseman (40)     Complete 'Shock and Awe' on Veteran difficulty
The Second Horseman (40)     Complete 'Safehouse' on Veteran difficulty
The Shot (40)     Complete 'All Ghillied Up' and 'One Shot, One Kill' on Veteran difficulty
The Third Horseman (40)     Complete 'Heat' and 'The Sins of the Father' on Veteran difficulty
The Ultimatum (40)     Complete 'Ultimatum', 'All in' and 'No Fighting in the War Room' on Veteran difficulty
The Fourth Horseman (40)     Complete 'Game Over' on Veteran difficulty
Daredevil (10)     Kill an enemy while blinded by a flashbang in the single player campaign
Roadkill (10)     Kill 2 enemies by blowing up a car in the single player campaign
Bird on the Ground (20)     Shoot down an enemy helicopter with an RPG in the single player campaign
Four of a Kind (20)     Kill 4 enemies in a row with headshots in the single player campaign
Three of a Kind (10)     Kill 3 enemies in a row with your knife in the single player campaign
Unlock Arcade and Cheat Option
These Unlock automatically for completing Call of Duty 4: modern Warfare on and difficulty level. Cheat menu can be found during gameplay in the options menu.
Unlockable     How to Unlock
Arcade Mode     Complete game on any difficulty
Cheat Menu     Complete game on any difficulty
Cheats
Cheats are unlocked by collecting enemy intel, which look like laptop computers, that are hidden throughout the campaign.
Unlockable     How to Unlock
CoD Noir: Simply turns all gameplay turns black and white, giving the game a classic war movie feel.     Collect 2 pieces of enemy intel.
Photo-Negative: Inverses all of the colors of the game.     Collect 4 pieces of enemy intel.
Super Contrast: Dramatically increases the game's contrast, making the darks much darker and the lights much lighter.     Collect 6 pieces of enemy intel.
Ragtime Warfare: Gameplay goes black-and-white, dust and scratches fill the screen, it plays at 2x speed, and the music becomes piano music.     Collect 8 pieces of enemy intel.
Cluster Bombs: After one of your frag grenades explodes, four more explode in a cross-shape pattern.     Collect 10 pieces of enemy intel.
A Bad Year: When you kill enemies, they explode into a bunch of old tires!     Collect 15 pieces of enemy intel.
Slow-Mo Ability: By using the melee button, you can change the game to slow-mo and play at half-speed.     Collect 20 pieces of enemy intel.
Infinite Ammo: Wepaons have unlimited ammo, you don't even need to reload! Doesn't work with single-shot weapons like C4 and Claymores.     Collect 30 pieces of enemy intel.
Multiplayer Weapons
Each weapon is unlocked in multiplayer at a certain rank.
Unlockable     How to Unlock
Sniper Rifle - M40     Reach Rank 04
Assault Rifle - M4 Carbine     Reach Rank 10
SMG - Mini Uzi     Reach Rank 13
Pistol - M1911     Reach Rank 16
LMG - M60E4     Reach Rank 19
Sniper Rifle - Dragunov     Reach Rank 22
Assault Rifle - G3     Reach Rank 25
SMG - AK-74U     Reach Rank 28
Shotgun - M1014     Reach Rank 31
Sniper Rifle - R700     Reach Rank 34
Assault Rifle - G36C     Reach Rank 37
SMG - P90     Reach Rank 40
Pistol - Desert Eagle     Reach Rank 43
Assault Rifle - M14     Reach Rank 46
Sniper Rifle - Barret     Reach Rank 49
Assault Rifle - MP44     Reach Rank 52
Pistol - Golden Desert Eagle     Reach Rank 55
Golden Weapons
Golden weapons are a special camo that you get when you fully complete their respective weapon challenges.You can access them by choosing the camo of the respective weapon.The weapons don't get a boost or anything alike,it's purely cosmetic.
Unlockable     How to Unlock
Golden Desert Eagle     Get to Lv.55.
Golden Ak-47     Complete all Assault Rifle challenges.
Golden M60     Complete all LMG challenges.
Golden Mini-Uzi     Complete all SMG challenges.
Golden Dragonuv     Complete all Sniper challenges.
Golden M1014     Complete all Shotgun challenges.