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Destroy 30 dandelions.

Dandelions are present in only Forest levels, and mainly in the earlier ones. You'll likely confuse some of these with Shinies at first. To destroy them, you just need to pass through them. This achievement is cumulative and there's a good possibility you'll unlock this achievement naturally, depending on how many times you die and have to retry Forest levels. If not, you can simply replay the first level over and over until the achievement unlocks.