This achievement is most easily earned on the easy difficulty. Once Air Raid deactivates the red laser barrier don't worry about health, just fly as fast as possible after him. When you get to the second barrier, take out the two mounted canons on either side as quickly as possible. For me, it was easier to fly in, transform to robot mode, and then as I was falling, lock on with my rockets and take out the canon, then fly over and repeat on the second canon, then fly off after Air Raid again.