you will need to have completed the achievement Hop, Skip, and Jump to enter this level.
This achievement can be completed within the first 15 second of entering the Artisans World level Sunny Flight. As soon as you spawn in, head towards the train tracks. Fly under one of the arches and press
to do a loop de loop around the train tracks and back under the arch. That will get you the Barnstormer achievement.
All Achievements Video: Barnstormer at 0:56