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Clean all smoke blocks in a level.

If you're wondering what smoke blocks are, they are the blocks that vaporize after you touch them. You'll encounter these in some of the later Forest levels and then some House levels. To unlock this achievement, you need to touch every smoke block in a single level to make them all disappear. You don't need to actually finish the level after doing this. The achievement unlocks mid-level as soon as the last smoke block disappears.

There are multiple levels with smoke blocks, but most are spread out or in precarious areas where you could easily die. The best level to unlock this achievement in is level 60. Right in the beginning you'll climb up a wall and there will be a long row of smoke blocks over some spikes and a porcupine below. Simply start on the leftmost smoke block and run all the way across to the rightmost smoke block. This will make them all disappear and will unlock the achievement immediately.