Speed Limit (UP)

To get this achievement you must pass through the wing holes in the 2 planes on Stage 11, this level can only be accessed on Normal difficulty after completing the first 10 levels. You'll see smoke coming from all the debris in the level while you fly downwards, the plane wings let out a lot of smoke so you can easily predict where the holes will be, if you miss any of the holes or die you can simply quit out to the main menu and retry.

Here's a video of me getting the achievement: