If you haven't unlocked this by the time you unlock Stadium Stunts (second set of maps) you're in luck. The very first level of Stadium Stunts "Rise" is a super easy level to get this. At the very end you'll be shot upwards with a bunch of speed boosts through several levels of the map. Just keep your stuntman level with his head facing up. Eventually, he'll crash into a ceiling and then fall across the finish line. Easy as pie. You might even get this without trying.
Comments and questions below please.