iStunt 2

These two achievements will most definitely come without trying sometime throughout the game, but they can both easily be completed simultaneously on the very first level of Insane Hills. Towards the end of the level you will go around a loop and then over a small jump, collecting three gold stars after the jump. After collecting the last of these stars, instead of landing normally, land so that your guy falls forward off the board. This may take several attempts, but if done correctly, he will go tumbling towards the right, collecting the star and then across the finish line, unlocking both of these achievements.