During your deployment in Urzikstan you will come across contract satellite phones which allow you to participate in various challenges. You will see these on your map as little blue tokens with symbols on them which refer to the type of challenge you will be expected to participate in.
You will naturally complete this achievement by playing the game as intended, however if you are struggling remember the white area is the easiest and it grows in difficulty when you enter into the orange area and once again into the red area.