Rootinest, Tootinest, Shootinest

This is an insanely easy achievement to get if your character level is 10 or higher. Go to Skag Gully, mainly because these are the first Raak you encounter in the game and they are weak, and go to the farthest point from the entrance by the two dead bodies under the shelter. Make sure you do not shoot any of the Raak yet, you want to have as many as seven of them in the air just for some liability if you miss one. have equiped either an SMG with a good rate of fire and damage over 15, or an assault rifle with same specs as the SMG. I perferably went with Bone Crusher an SMG you get from killing Bone Head. Make a warning shot at the Raak Hive on the ground to make a few come and an coagulate in the air. one they spot you they will bombard you in the air in a nice compact group. All you have to do is aim down your sight and shoot at a fair distance until you take every single one of them down. Bingo and there you have it, 10 points for shooting down five Raak in ten seconds.