This is first possible on the Tutorial. After you are taught to twirl-glide (hold
), you are then taught to dash (
) blocks apart. There are three enemies pretty close to each other here.
Make sure you are the RED sister and jump over the first owl while he is walking to the left. Then jump and aim your dash into the rocky area above the second owl. This will take two dashes to remove all the rocks, and you can't land on the owl underneath. Then, either jump over the first or third owl to be at one end of the enemies or the other. Now, jump on top of the closest owl, then bounce and dash to the next owl, and again to the next owl.
Do this without touching the ground, and POP! Achievement.
If you are having trouble,
Sliktor has a helpful hint:
"You can double jump next to the rocks and break through in a single dash. Removes the risk of trying not to land on that 2nd owl (which I couldn't manage with 2 dashes)."
If you mess up and need to start over, just get yourself killed by any remaining owls, including the green ones further along to the right (touch green owl from underneath).