Call of Duty: Modern Warfare 2 Achievements / Trophies

Three-some

Campaign - Team Player :: After getting out of the Humvee and moving forward at the very start of the mission you'll be told to use your grenade launcher on the enemies at the far end. There are quite a few groups back there and you have 10 grenades to launch.

No Rest For the Wary

Campaign - Cliffhanger :: This whole mission is about stealth so it will be easy to sneak up behind any of the many soldiers and stab them with your knife. If you are going for Ghost also, just reload Last Checkpoint once achievement is registered and then re-do the section without killing the soldier. You can also do this in Spec Ops - Hidden - As the very first enemy has his back to you.

Some Like it Hot

Campaign - Wolverines! :: You will be told to head to the roof of Dave's restaurant. There is a thermal weapon up there. Just go prone, use your aim button to go thermal, and then start firing. There are way more than 6 enemies to take out here.

Ten plus foot-mobiles

Campaign - Wolverines! :: Once you get into Burger Town you will be told to use the Predator missile to take out a couple large groups of enemies. Aim for the center of the group and you'll get a lot more then 10. There are 2 separate groups that come one after the other so this should not be a problem.

Two Birds with One Stone

Spec Ops - Alpha - Sniper Fi :: You have a Barrett .50 cal sniper to start. There is a small driveway area on the left side that a TON of guys will be coming through. Just line up a shot that will take out two enemies at once.

Desperado

Spec Ops - Alpha - Sniper Fi :: You start with 5 weapons all right next to you. The claymores and grenades count to. Simply use one weapon and get a kill. Switch weapons and repeat. Pretty easy to do even on Veteran.

Unnecessary Roughness

In the campaign you can get this in No Russian or Gulag. Near the end of the mission there will be LINES of enemies all with Riot Shields. Kill one, take shield, go bash someone. The No Russian mission is one of the missions that will be skipped if you said at the start of the game you didn't want to see anything too shocking. In that case your other options are Breach and Clear in Spec Ops or you will pretty much be forced to bash someone with the Riot Shield in Gulag.

Knock-knock

Breach and Clear in Spec Ops. Just fire your assault rifle's grenade launcher into the back of the room. That's 4 kills with 1 shoot. In the campaign you can get this in The Only Easy Day...Was Yesterday. There are 3 separate breach and clear events and each one has at least 4 enemies in the open.

Drive By

The Race mission in Spec Ops is the easiest place for this. Obviously you want to concentrate more on kills then time. The enemies do not fire at you very much so it's pretty hard to actually die. Make sure to go through the section with foot mobiles slowly to get everyone. You should get the 20 by the time you hit the frozen lake.

The Harder They Fall

Absolute easiest place to get this is in Overwatch in Spec Ops. This mission REQUIRES 2 people to play. The person going for the achievement wants to be the Gunner in the AC130. At least 5 times in the mission enemy helicopter will come to drop off enemies. Simply blow the helicopter out of the air. The helicopters can be hard to see on the Night Vision view but overall very very very easy to do.

Look Ma Two Hands

The Spec Ops mission Bomb Squad starts you out with Dual Glocks. You need to be careful because these things RIP through ammo like it's going out of style. Play on recruit so you can line up your shoot and DON'T fire both at once. Once 10 enemies are dead the achievement will pop. There are exactly 10 enemies in the far right first area.