For this achievement, the best level 2-23.
In this level, you have three vertical air pushers, which you can use to maintain the candy in the air.
When you start the level, push the middle one so the candy attach to the two spider ropes above. Then quickly cut all 4 ropes and start pressing the higher air pusher, you must keep the candy in the air for 30 sec, which is not difficult. But if you have problems, you can still use the two pushers below to help.
UPDATE: If you're struggling to get this on level 2-23, there are other good options pointed in guides made by other users in this page. So, I strongly recommend you try their options too.