De achievements van Call of Duty: Modern Warfare 3 zijn vrijgegeven. Dankzij deze achievements zullen we we extra informatie krijgen over Modern Warfare 3's singleplayer en spec ops mode.

SPOILER-GEVAAR: Onderstaande lijst kan spoilers bevatten.

• Back in the Fight - Start the Single Player Campaign on any difficulty.
• Too Big to Fail  - Destroy the Jamming Tower. Complete "Black Tuesday" on any difficulty. 
• Wet Work  - Take back New York Harbor. Complete "Hunter Killer" on any difficulty. 
• Carpe Diem - Escape the mountain safe house. Complete "Persona Non Grata" on any difficulty. 
• Frequent Flyer - Defend the Russian President. Complete "Turbulence" on any difficulty.
• Up to No Good - Infiltrate the village. Complete "Back on the Grid" on any difficulty. 
• One Way Ticket - Make it to Westminster. Complete "Mind the Gap" on any difficulty. 
• Welcome to WW3 - Save the US Vice President. Complete "Goalpost" on any difficulty. 
• Sandstorm! - Assault the shipping company. Complete "Return to Sender" on any difficulty. 
• Back Seat Driver - Track down Volk. Complete "Bag and Drag" on any difficulty. 
• We'll Always Have Paris - Escape Paris with Volk. Complete "Iron Lady" on any difficulty. 
• Vive la Révolution! - Reach the church. Complete "Eye of the Storm" on any difficulty. 
• Requiem - Escape the city. Complete "Blood Brothers" on any difficulty. 
• Storm the Castle - Discover Makarov's next move. Complete "Stronghold" on any difficulty. 
• Bad First Date - Find the girl. Complete "Scorched Earth" on any difficulty. 
• Diamond in the Rough - Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty.
• The Big Apple - Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty. 
• Out of the Frying Pan... - Complete "Persona Non Grata", "Turbulence", and "Back on the Grid" on Veteran difficulty. 
• Payback - Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty. 
• City of Lights - Complete "Bag and Drag" and "Iron Lady" on Veteran difficulty. 
• The Darkest Hour - Complete "Eye of the Storm", "Blood Brothers", and "Stronghold" on Veteran difficulty. 
• This is the End - Complete "Scorched Earth", "Down the Rabbit Hole", and "Dust to Dust" on Veteran difficulty. 
• Who Dares Wins - Complete the campaign on any difficulty.
• The Best of the Best - Complete the campaign on Hardened or Veteran difficulty.
• Strike! - Kill 5 enemies with a single grenade in Single Player or Special Ops. 
• Jack the Ripper - Melee 5 enemies in a row in Single Player or Special Ops. 
• Informant - Collect 22 Intel Items. 
• Scout Leader - Collect 46 Intel Items.
• This Is My Boomstick - Kill 30 enemies with the XM25 in "Black Tuesday."
• What Goes Up... - Destroy all the choppers with only the UGV's grenade launcher in "Persona Non Grata."
• For Whom the Shell Tolls - Destroy all targets during the mortar sequence with only 4 shells in "Back on the Grid."
• Kill Box - Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender."
• Danger Close - Take down a chopper with an AC-130 smoke grenade in "Bag and Drag."
• Ménage à Trois - Destroy 3 tanks with a single 105mm shot in "Iron Lady." 
• Nein - Kill 9 enemies with A-10 strafing runs in "Scorched Earth." 
• 50/50 - Complete a Special Ops Mission Mode game with the same number of kills as your partner.
• Birdie - Kill 2 enemy helicopters without getting hit in a Special Ops Survival game.
• Serrated Edge - Finish a Juggernaut with a knife in Special Ops. 
• Arms Dealer - Buy all items from the Survival Weapon Armory. 
• Danger Zone - Buy all items from the Survival Air Support Armory.
• Defense Spending - Buy all items from the Survival Equipment Armory.
• Get Rich or Die Trying - Have $50,000 current balance in a Special Ops Survival game.
• I Live - Survive 1 wave in a Special Ops Survival game.
• Survivor - Reach Wave 10 in each mission of Special Ops Survival mode.
• Unstoppable - Reach Wave 15 in each mission of Special Ops Survival mode.
• No Assistance Required - Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed.
• Brag Rags - Earn 1 star in Special Ops Mission Mode.
• Tactician - Earn 1 star in each mission of Special Ops Mission Mode.
• Overachiever - Earn 48 stars in Special Ops Mission Mode.
• Secret Achievement - Continue playing to unlock this secret achievement