Hints
NOTE: As their name suggests hints are not exactly Call of Duty: Modern Warfare 3 cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Call of Duty: Modern Warfare 3 even more entertaining.
Steam Achievements
50/50: Complete a Special Ops Mission Mode game with the same number of kills as your partner.
Arms Dealer: Buy all items from the Survival Weapon Armory.
Back in the Fight: Start the Single Player Campaign on any difficulty.
Back Seat Driver: Track down Volk. Complete "Bag and Drag" on any difficulty.
Bad First Date: Find the girl. Complete "Scorched Earth" on any difficulty.
Birdie: Kill 2 enemy helicopters without getting hit in a Special Ops Survival game.
Brag Rags: Earn 1 star in special ops mission mode.
Carpe Diem: Escape the mountain safe house. Complete "Persona Non Grata" on any difficulty.
City of Lights: Complete "Bag and Drag" and "Iron Lady" on Veteran difficulty.
Danger Close: Take down a chopper with an AC-130 smoke grenade in "Bag and Drag."
Danger Zone: Buy all items from the Survival Air Support Armory.
Defense Spending: Buy all items from the Survival Equipment Armory.
Diamond in the Rough: Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty.
Flight Attendant: Kill all 5 enemies during the zero-g sequence in "Turbulence."
For Whom the Shell Tolls: Destroy all targets during the mortar sequence with only 4 shells in "Back on the Grid."
Frequent Flyer: Defend the Russian President. Complete "Turbulence" on any difficulty.
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.
Informant: Collect 22 intel items.
Jack the Ripper: Melee 5 enemies in a row in Single Player or Special Ops.
Kill Box: Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender."
M'nage � Trois: Destroy 3 tanks with a single 105mm shot in "iron lady."
Nein: Kill 9 enemies with a-10 strafing runs in "scorched earth."
No Assistance Required: Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed.
One Way Ticket: Make it to Westminster. Complete "Mind the Gap" on any difficulty.
Out of the Frying Pan...: Complete "Persona Non Grata", "Turbulence", and "Back on the Grid" on Veteran difficulty.
Overachiever: Earn 48 stars in special ops mission mode.
Payback: Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty.
Requiem: Escape the city. Complete "Blood Brothers" on any difficulty.
Sandstorm!: Assault the shipping company. Complete "Return to Sender" on any difficulty.
Scout Leader: Collect 46 intel items.
Serrated Edge: Finish a Juggernaut with a knife in Special Ops.
Storm the Castle: Discover makarov's next move. complete "stronghold" on any difficulty.
Strike!: Kill 5 enemies with a single grenade in Single Player or Special Ops.
Survivor: Reach Wave 10 in each mission of Special Ops Survival mode.
Tactician: Earn 1 star in each mission of special ops mission mode.
The Best of the Best: Complete the campaign on Hardened or Veteran difficulty.
The Big Apple: Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty.
The Darkest Hour: Complete "Eye of the Storm", "Blood Brothers", and "Stronghold" on Veteran difficulty.
This Is My Boomstick: Kill 30 enemies with the xm25 in "black tuesday."
This is the End: Complete "Scorched Earth", "Down the Rabbit Hole", and "Dust to Dust" on Veteran difficulty.
Too Big to Fail: Destroy the Jamming Tower. Complete "Black Tuesday" on any difficulty.
Unstoppable: Reach Wave 15 in each mission of Special Ops Survival mode.
Up to No Good: Infiltrate the village. Complete "Back on the Grid" on any difficulty.
Vive la R'volution!: Reach the church. Complete "Eye of the Storm" on any difficulty.
We'll Always Have Paris: Escape Paris with Volk. Complete "Iron Lady" on any difficulty.
Welcome to WW3: Save the US Vice President. Complete "Goalpost" on any difficulty.
Wet Work: Take back New York Harbor. Complete "Hunter Killer" on any difficulty.
What Goes Up...: Destroy all the choppers with only the UGV's grenade launcher in "Persona Non Grata."
Who Dares Wins: Complete the campaign on any difficulty.
Steam Achievements
50/50: Complete a Special Ops Mission Mode game with the same number of kills as your partner.
Arms Dealer: Buy all items from the Survival Weapon Armory.
Back in the Fight: Start the Single Player Campaign on any difficulty.
Back Seat Driver: Track down Volk. Complete "Bag and Drag" on any difficulty.
Bad First Date: Find the girl. Complete "Scorched Earth" on any difficulty.
Birdie: Kill 2 enemy helicopters without getting hit in a Special Ops Survival game.
Brag Rags: Earn 1 star in special ops mission mode.
Carpe Diem: Escape the mountain safe house. Complete "Persona Non Grata" on any difficulty.
City of Lights: Complete "Bag and Drag" and "Iron Lady" on Veteran difficulty.
Danger Close: Take down a chopper with an AC-130 smoke grenade in "Bag and Drag."
Danger Zone: Buy all items from the Survival Air Support Armory.
Defense Spending: Buy all items from the Survival Equipment Armory.
Diamond in the Rough: Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty.
Flight Attendant: Kill all 5 enemies during the zero-g sequence in "Turbulence."
For Whom the Shell Tolls: Destroy all targets during the mortar sequence with only 4 shells in "Back on the Grid."
Frequent Flyer: Defend the Russian President. Complete "Turbulence" on any difficulty.
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.
Informant: Collect 22 intel items.
Jack the Ripper: Melee 5 enemies in a row in Single Player or Special Ops.
Kill Box: Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender."
M'nage � Trois: Destroy 3 tanks with a single 105mm shot in "iron lady."
Nein: Kill 9 enemies with a-10 strafing runs in "scorched earth."
No Assistance Required: Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed.
One Way Ticket: Make it to Westminster. Complete "Mind the Gap" on any difficulty.
Out of the Frying Pan...: Complete "Persona Non Grata", "Turbulence", and "Back on the Grid" on Veteran difficulty.
Overachiever: Earn 48 stars in special ops mission mode.
Payback: Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty.
Requiem: Escape the city. Complete "Blood Brothers" on any difficulty.
Sandstorm!: Assault the shipping company. Complete "Return to Sender" on any difficulty.
Scout Leader: Collect 46 intel items.
Serrated Edge: Finish a Juggernaut with a knife in Special Ops.
Storm the Castle: Discover makarov's next move. complete "stronghold" on any difficulty.
Strike!: Kill 5 enemies with a single grenade in Single Player or Special Ops.
Survivor: Reach Wave 10 in each mission of Special Ops Survival mode.
Tactician: Earn 1 star in each mission of special ops mission mode.
The Best of the Best: Complete the campaign on Hardened or Veteran difficulty.
The Big Apple: Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty.
The Darkest Hour: Complete "Eye of the Storm", "Blood Brothers", and "Stronghold" on Veteran difficulty.
This Is My Boomstick: Kill 30 enemies with the xm25 in "black tuesday."
This is the End: Complete "Scorched Earth", "Down the Rabbit Hole", and "Dust to Dust" on Veteran difficulty.
Too Big to Fail: Destroy the Jamming Tower. Complete "Black Tuesday" on any difficulty.
Unstoppable: Reach Wave 15 in each mission of Special Ops Survival mode.
Up to No Good: Infiltrate the village. Complete "Back on the Grid" on any difficulty.
Vive la R'volution!: Reach the church. Complete "Eye of the Storm" on any difficulty.
We'll Always Have Paris: Escape Paris with Volk. Complete "Iron Lady" on any difficulty.
Welcome to WW3: Save the US Vice President. Complete "Goalpost" on any difficulty.
Wet Work: Take back New York Harbor. Complete "Hunter Killer" on any difficulty.
What Goes Up...: Destroy all the choppers with only the UGV's grenade launcher in "Persona Non Grata."
Who Dares Wins: Complete the campaign on any difficulty.
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