Do a 900 double frontflip

Answer from: IhateMorobir
On the initial jump you have to jump just enough so you hit the top of the upper landing without hitting the "stop". Once you hit that upper landing (without hitting the stop) jump again and then you should have enough height and time to do the 900 and double front flip.

Answer from: Cheppi
On the first ramp of the level, jump about 1/4 way up the ramp. You want to hit the next platform and jump again. Your momentum will propel you high enough to do the 900 double front. 900 is five swipes in the same direction laterally. You don't have to land the jump to earn the achievement. FYI.

Answer from: Bkelevate
I've already purchased helicopter so everytime I try to do a 900 double front flip it turns into 180, helicopter, 180, front flip, 180, helicopter, 180, double front flip

Answer from: SkaterKing
You have to do the tricks seperate 900 then Double backflip! Let me know if you have trouble collecting the last coin!!!