Marraskuun 8. päivä julkaistavan Modern Warfare 3:n saavutukset on julkaistu. Pieni spoileri varoitus heti alkuun sillä, joukossa on paljon mahdollisia juonipaljastuksia sisältäviä achievementtejä/trophyjä, joten listan lukemista kannattaa harkita. Saavutukset ovat linjassa pelisarjan aiempiin peleihin, sillä suurin osa niistä keskittyy yksinpelikampanjaan ja loput Special Opsiin. Jostain syystä Activision vieläkin karsastaa perinteisessä moninpelissä jaettavia saavutuksia.

- Back in the Fight (5) - Start the Single Player Campaign on any difficulty. 
- Too Big to Fail (10) - Destroy the Jamming Tower. Complete "Black Tuesday" on any difficulty. 
- Wet Work (10) - Take back New York Harbor. Complete "Hunter Killer" on any difficulty. 
- Carpe Diem (10) - Escape the mountain safe house. Complete "Persona Non Grata" on any difficulty. 
- Frequent Flyer (10) - Defend the Russian President. Complete "Turbulence" on any difficulty.
- Up to No Good (10) - Infiltrate the village. Complete "Back on the Grid" on any difficulty. 
- One Way Ticket (10) - Make it to Westminster. Complete "Mind the Gap" on any difficulty.
- Welcome to WW3 (10) - Save the US Vice President. Complete "Goalpost" on any difficulty. 
- Sandstorm! (10) - Assault the shipping company. Complete "Return to Sender" on any difficulty. 
- Back Seat Driver (10) - Track down Volk. Complete "Bag and Drag" on any difficulty. 
- We'll Always Have Paris (10) - Escape Paris with Volk. Complete "Iron Lady" on any difficulty. 
- Vive la Révolution! (10) - Reach the church. Complete "Eye of the Storm" on any difficulty. 
- Requiem (10) - Escape the city. Complete "Blood Brothers" on any difficulty. 
- Storm the Castle (10) - Discover Makarov's next move. Complete "Stronghold" on any difficulty. 
- Bad First Date (10) - Find the girl. Complete "Scorched Earth" on any difficulty. 
- Diamond in the Rough (10) - Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty. 
- The Big Apple (25) - Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty. 
- Out of the Frying Pan... (25) - Complete "Persona Non Grata", "Turbulence", and "Back on the Grid" on Veteran difficulty. 
- Payback (25) - Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty. 
- City of Lights (25) - Complete "Bag and Drag" and "Iron Lady" on Veteran difficulty. 
- The Darkest Hour (25) - Complete "Eye of the Storm", "Blood Brothers", and "Stronghold" on Veteran difficulty. 
- This is the End (25) - Complete "Scorched Earth", "Down the Rabbit Hole", and "Dust to Dust" on Veteran difficulty. 
- Who Dares Wins (40) - Complete the campaign on any difficulty. 
- The Best of the Best (100) - Complete the campaign on Hardened or Veteran difficulty. 
- Strike! (20) - Kill 5 enemies with a single grenade in Single Player or Special Ops. 
- Jack the Ripper (20) - Melee 5 enemies in a row in Single Player or Special Ops. 
- Informant (20) - Collect 22 Intel Items. 
- Scout Leader (35) - Collect 46 Intel Items.
- This Is My Boomstick (20) - Kill 30 enemies with the XM25 in "Black Tuesday." 
- What Goes Up... (20) - Destroy all the choppers with only the UGV's grenade launcher in "Persona Non Grata." 
- For Whom the Shell Tolls (20) - Destroy all targets during the mortar sequence with only 4 shells in "Back on the Grid." 
- Kill Box (20) - Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender." 
- Danger Close (20) - Take down a chopper with an AC-130 smoke grenade in "Bag and Drag." 
- Ménage à Trois (20) - Destroy 3 tanks with a single 105mm shot in "Iron Lady." 
- Nein (20) - Kill 9 enemies with A-10 strafing runs in "Scorched Earth." 
- 50/50 (20) - Complete a Special Ops Mission Mode game with the same number of kills as your partner. 
- Birdie (20) - Kill 2 enemy helicopters without getting hit in a Special Ops Survival game. 
- Serrated Edge (15) - Finish a Juggernaut with a knife in Special Ops. 
- Arms Dealer (20) - Buy all items from the Survival Weapon Armory. 
- Danger Zone (20) - Buy all items from the Survival Air Support Armory. 
- Defense Spending (20) - Buy all items from the Survival Equipment Armory. 
- Get Rich or Die Trying (25) - Have $50,000 current balance in a Special Ops Survival game. 
- I Live (10) - Survive 1 wave in a Special Ops Survival game. 
- Survivor (20) - Reach Wave 10 in each mission of Special Ops Survival mode. 
- Unstoppable (40) - Reach Wave 15 in each mission of Special Ops Survival mode. 
- No Assistance Required (20) - Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed. 
- Brag Rags (10) - Earn 1 star in Special Ops Mission Mode. 
- Tactician (20) - Earn 1 star in each mission of Special Ops Mission Mode. 
- Overachiever (40) - Earn 48 stars in Special Ops Mission Mode. 
- Secret Achievement (20) - Continue playing to unlock this secret achievement.

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