Pull a special trick during a Sprint event.

To obtain this achievement set up a Single Sprint event for ten laps on Kiwi Glacier in reverse. There is only one jump on this track and in reverse you get some pretty good hang time so you may not need more than five or six laps. However, it's always good to have a few "safety" laps just in case.

Once you hit the jump 4 or 5 times you should have your Thrill Meter built up enough to get your Special Trick. The next time around be sure to be fast by boosting into it and using a full pre-load. Then engage your stunt right away. You should land it with ease if done properly.

Note: Of all the Special Tricks in the game, each riders stunt seems to last a about a second less than the standard stunts. So, your chances at this achievement are hugely increased if you use up on the Left Stick with both Left Bumper and Right Bumper