Normally, this would be a tricky trophy, but luckily there's an easy glitch. Here are the steps to reproduce it:
- Go to Skill Showcase event and select Airtime FMX track.
- Ride your bike all the way to the last checkpoint, and stop by the big fan.
- You want to slowly inch over the ramp so that the fan blows you up into the air.
- Now you want to move your right stick in one direction to perform a trick, and hold it there.
- At the same time keep rotating your bike counterclockwise with the left stick.
- Your score counter will continue increasing, and once it passes 20,000 you can bail out with .
- After your rider hits the ground, simply wait for the track timer to run out, and you will be awarded the trophy.
Credit for discovering this method goes to Chris Oak. Here's his video: