Here is how I did this achievement:
You can do on any difficulty, but of course the first one, Chilled difficulty is easier. I did on the 175% speed, so it would take less time, but you can do on any speed - make yourself confortable.
On level 2 (Biham) or level 6 (Hao) take the right path. It will get harder but it's duable.
Here is the most importante thing about this achievement:
Stay in the midle of you phone screen and on the left of it. Center - left is the place you want to be. Just stay there until the pie spawns. Doing so, shot the pie and take the lifes.
It won't take long for the pie to respawn. Take your time.
Let me know if you have any problems or doubts with that.