iStunt 2

This achievement requires that you stay in the air for at least 7 consecutive seconds AND then make a perfect landing. It will definitely come without trying, but to get it out of the way early you can do it on the very first level of Insane Hills. From the start of the level, you will fall a tiny bit, then enter a tutorial pop-up, before falling a long distance to the ramp below. Let the tutorial stay on screen for several seconds, as it actually counts towards your air time. Then close it and attempt to make a perfect landing when you fall below. This may take several tries to get the "Perfect Landing" to pop up.