FUEL

Find a big jump with a quad or bike and go back and forth off of it your guy will automatically do a trick if you are high enough, do this 200 times for the achievement.

The A button is NOT a trick button! Your driver will do tricks automatically on an ATV or a Bike IF he hits a big enough jump and with enough speed.

EDIT - OK what DubbeL FriSSS wrote IS correct, so I do give him credit. But let me tell you it is not necessary. You don not have to press a button or touch the Left stick to do a trick. You can sometimes press the left stick in the direction desired like DubbeL FriSSS said below. But if you do not, your driver will still DO a trick. No action is necessary.

Essentially there are 2 ways to get this achievement.

1. If you want it quick, you can follow the advice of "sword of life" and find a big jump and go back and forth.

or

2. If you intend to try and get the other achievements in this game, just play it normally and it will come in time with no real effort.
You can help things along by doing any "free-roam" riding searching for vistas, barrels etc, on a bike and just try to hit the mud slopes that edge the roads at a fair speed. When added to the jumps you'll get during races it will pop easily in time.