Few of the achievements in this game could be considered easy, and that certainly applies to this achievement.
To get this achievement, you must complete the Groundhog Returns level (under Medium difficulty), with 0 faults, and with never touching the left stick. That leaves you with only the gas and brake to control the orientation of the biker, which neither happen to work while airborne for obvious reasons. Needless to say this can get a bit complicated.
The bike I managed to complete this with was the Scorpion 250cc. Anything else seems too prone to flip. This has been the general consensus from what I understand.
The Achievement Hunter video below should prove helpful in figuring out which parts you need to have a light touch on.
Major Comment:
Drakenden said:If you're having trouble getting this achievement to pop, it might be because you, like me, have an old controller and thumbsticks tend to wear down and become off-centered, so it counts as "touching it"... Mine didn't unlock because of that, will try again once I get a new controller...