When it's your turn getting this Achievement online boosting, equip your pistol by hitting
and shoot randomly in mid-air and after that; make sure you have 2 bullets left in the clip. (It doesn't have to be every single clip to run out, it can be in just 1 clip.)
Then aim at the head and shoot Twice and the Achievement should pop up.Before you give me a negative vote, please explain yourself why you did it and I will be more than happy to improve my solution. Thank You.