Call of Duty: Modern Warfare® 2
Modern Warfare® 2 has been played by members of XboxTweet. They unlocked these achievements (secret ones not listed):
- Back in the Saddle
Help train the local militia. 
- Black Diamond
Complete 'Cliffhanger' on Veteran Difficulty. 
- Blackjack
Earn 21 stars in Special Ops. 
- Charlie On Our Six
Earn 8 stars in Special Ops. 
- Cold Shoulder
Infiltrate the snowy mountain side base. 
- Colonel Sanderson
Kill 7 chickens in under 10 seconds in 'The Hornet's Nest'. 
- Danger Close
Get hand picked for Shepherd's elite squad. 
- Desperado
Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops. 
- Desperate Times
Execute the plan to help the Americans. 
- Downed but Not Out
Kill 4 enemies in a row while downed in Special Ops. 
- Drive By
Kill 20 enemies in a row while driving a vehicle in Single Player or Special Ops. 
- Ends Justify the Means
Complete 'Contingency' on Veteran Difficulty 
- First Day of School
Complete 'S.S.D.D' and 'Team Player' on Veteran Difficulty. 
- For the Record
Complete the Single Player campaign on any difficulty. 
- Ghost
Plant the C4 in 'Cliffhanger' without alerting or injuring anyone in the blizzard. 
- Gold Star
Earn 1 star in Special Ops. 
- Homecoming
Complete 'Of Their Own Accord', 'Second Sun', and 'Whiskey Hotel' on Veteran Difficulty. 
- Honor Roll
Earn at least 1 star in each Special Op mission. 
- Hotel Bravo
Earn 4 stars in Special Ops. 
- I'm the Juggernaut…
Kill a Juggernaut in Special Ops. 
- It Goes to Eleven
Earn at least 1 star in 11 different Special Op missions. 
- Knock-knock
Kill 4 enemies with 4 shots during a slow-mo breach in Single Player or Special Ops. 
- Leave No Stone Unturned
Collect 45 enemy intel items. 
- Look Ma Two Hands
Kill 10 enemies in a row using akimbo weapons in Single Player or Special Ops. 
- No Rest For the Wary
Knife an enemy without him ever knowing you were there in Single Player or Special Ops. 
- Off the Grid
Complete 'Just Like Old Times' and 'Endgame' on Veteran Difficulty. 
- Operational Asset
Earn all 3 stars in at least 5 different Special Op missions. 
- Operative
Earn all 3 stars in at least 10 different Special Op missions. 
- Out of the Frying Pan…
Complete the mission in the airplane graveyard. 
- Pit Boss
Run The Pit in 'S.S.D.D' and finish with a final time under 30 seconds. 
- Prisoner #627
Complete 'The Only Easy Day... Was Yesterday' and 'The Gulag' on Veteran Difficulty. 
- Professional
Earn all 3 stars in at least 15 different Special Op missions. 
- Queen takes Rook
Complete 'Loose Ends' and 'The Enemy of My Enemy' on Veteran Difficulty. 
- Red Dawn
Complete 'Wolverines!' and 'Exodus' on Veteran Difficulty. 
- Royale with Cheese
Defend Burger Town. 
- Soap on a Rope
Storm the gulag. 
- Some Like it Hot
Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops. 
- Specialist
Earn 30 stars in Special Ops. 
- Star 69
Earn 69 stars in Special Ops. 
- Tag 'em and bag 'em
Find Rojas in the Favelas. 
- Ten plus foot-mobiles
Kill at least 10 enemies with one Predator missile in Single Player or Special Ops. 
- The Harder They Fall
Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops. 
- The Pawn
Assault Makarov's safe house. 
- The Price of War
Complete the single player campaign on Hardened or Veteran Difficulty. 
- The Road Less Traveled
Collect 22 enemy intel items. 
- Three-some
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops. 
- Turistas
Complete 'Takedown' and 'The Hornet's Nest' on Veteran Difficulty. 
- Two Birds with One Stone
Kill 2 enemies with a single bullet in Single Player or Special Ops. 
- Unnecessary Roughness
Use a riot shield to beat down an enemy in Single Player or Special Ops. 
- Whiskey Hotel
Take back Whiskey Hotel.
