Back in the Fight - 5G: Start the Single Player Campaign on any difficulty.
Too Big to Fail - 10G: Destroy the Jamming Tower. Complete "Black Tuesday" on any difficulty.
Wet Work - 10G: Take back New York Harbor. Complete "Hunter Killer" on any difficulty.
Carpe Diem- 10G: Escape the mountain safe house. Complete "Persona Non Grata" on any difficulty.
Frequent Flyer - 10G: Defend the Russian President. Complete "Turbulence" on any difficulty.
Up to No Good - 10G: Infiltrate the village. Complete "Back on the Grid" on any difficulty.
One Way Ticket - 10G: Make it to Westminster. Complete "Mind the Gap" on any difficulty.
Welcome to WW3 - 10G: Save the US Vice President. Complete "Goalpost" on any difficulty.
Sandstorm! - 10G: Assault the shipping company. Complete "Return to Sender" on any difficulty.
Back Seat Driver - 10G: Track down Volk. Complete "Bag and Drag" on any difficulty.
We'll Always Have Paris - 10G: Escape Paris with Volk. Complete "Iron Lady" on any difficulty.
Vive la Rvolution! - 10G: Reach the church. Complete "Eye of the Storm" on any difficulty.
Requiem - 10G: Escape the city. Complete "Blood Brothers" on any difficulty.
Storm the Castle - 10G: Discover Makarov's next move. Complete "Stronghold" on any difficulty.
Bad First Date - 10G: Find the girl. Complete "Scorched Earth" on any difficulty.
Diamond in the Rough - 10G: Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty.
The Big Apple - 25G: Complete "Black Tuesday" and "Hunter Killer" on Veteran difficulty.
Out of the Frying Pan... - 25G: Complete "Persona Non Grata", "Turbulence", and "Back on the Grid" on Veteran difficulty.
Payback - 25G: Complete "Mind the Gap", "Goalpost", and "Return to Sender" on Veteran difficulty.
City of Lights - 25G: Complete "Bag and Drag" and "Iron Lady" on Veteran difficulty.
The Darkest Hour - 25G: Complete "Eye of the Storm", "Blood Brothers", and "Stronghold" on Veteran difficulty.
This is the End - 25G: Complete "Scorched Earth", "Down the Rabbit Hole", and "Dust to Dust" on Veteran difficulty.
Who Dares Wins - 40G: Complete the campaign on any difficulty.
The Best of the Best - 100G: Complete the campaign on Hardened or Veteran difficulty.
Strike! - 20G: Kill 5 enemies with a single grenade in Single Player or Special Ops.
Jack the Ripper - 20G: Melee 5 enemies in a row in Single Player or Special Ops.
Informant - 20G: Collect 22 Intel Items.
Scout Leader - 35G: Collect 46 Intel Items.
This Is My Boomstick - 20G: Kill 30 enemies with the XM25 in "Black Tuesday."
What Goes Up... - 20G: Destroy all the choppers with only the UGV's grenade launcher in "Persona Non Grata."
For Whom the Shell Tolls - 20G: Destroy all targets during the mortar sequence with only 4 shells in "Back on the Grid."
Kill Box - 20G: Kill 20 enemies with the Chopper Gunner in a single run in "Return to Sender."
Danger Close - 20G: Take down a chopper with an AC-130 smoke grenade in "Bag and Drag."
Mnage Trois - 20G: Destroy 3 tanks with a single 105mm shot in "Iron Lady.")
Nein - 20G: Kill 9 enemies with A-10 strafing runs in "Scorched Earth."
50/50 - 20G: Complete a Special Ops Mission Mode game with the same number of kills as your partner.
Birdie - 20G: 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 - 20G: Buy all items from the Survival Weapon Armory.
Danger Zone - 20G: Buy all items from the Survival Air Support Armory.
Defense Spending - 20G: Buy all items from the Survival Equipment Armory.
Get Rich or Die Trying - 25G: Have $50,000 current balance in a Special Ops Survival game.
I Live - 10G: Survive 1 wave in a Special Ops Survival game.
Survivor - 20G: Reach Wave 10 in each mission of Special Ops Survival mode.
Unstoppable - 40G: Reach Wave 15 in each mission of Special Ops Survival mode.
No Assistance Required - 20G: Complete a Special Ops Mission Mode game on Hardened or Veteran with no player getting downed.
Brag Rags - 10G: Earn 1 star in Special Ops Mission Mode.
Tactician - 20G: Earn 1 star in each mission of Special Ops Mission Mode.
Overachiever - 40G: Earn 48 stars in Special Ops Mission Mode.
Secret Achievement - 20G: Continue playing to unlock this secret achievement.

hope i helped