For this you will need to play on the mission Embedded
. I recommend playing on Recruit difficulty,
Regarding the Play Dead achievement, after you've destroyed the helicopters you will jump through the window and Farah will open a gate
. She will then tell you to hide in the grass, then simply just take care of all the enemies in the area and the achievement will unlock.
If you are still struggling the fell free to use this as a reference.Call of Duty: Modern Warfare Companion Block & Play Dead Achievements Guide