HyperDot

You should get this achievement naturally while working on 100% completion, otherwise, if you want to grind it any level without the inflated modifier should do the trick.

This can be done very easily on Level 001 Beginnings if you want to grind it out early. Simply start the level and don’t move - you will die after about 2 seconds. Press A to restart the level and repeat. You should get the achievement in under 10 minutes. If you don’t have it already, you’ll also get: