This is a challenging achievement! to get this you're going to need to chain together huge combos and grab as many x2 power ups as you can. Make sure to recognize that the next jump isn't always as far away as it seems and if you boost all the way to it from the time you land the previous trick you can keep the combos going..!

On Ghost Creek, you can pull a Special Trick off of the second vertigo jump then boost to the next ramp before the turn and nail a couple of normal or modified tricks there before boosting again to the next series of three vertigo jumps where you should be able to do three more special tricks which should give you a lot of points (minimum 185,000 points). If you have a x2 power up at any point during this combo then this and the other two combo achievements are yours.