For this achievement, you have to dash 30 times in a single stage. This is done by moving the sticks back and forth in alternating directions.
I would advise doing this once you have unlocked the eternal mode for a level. To unlock the eternal mode, score over 100 points in that level. After you have dashed 30 times, you can exit the level by pressing X.
If you want to be extra efficient, you can do this achievement while earning this one (crash into a wall 30 times in one level):