WARNING: Squish skeletons, NOT bunnies: Challenge mislabelled

Mirality wrote:
I'm collecting bunnies for the campfire at the moment anyway, so I was wondering why it wasn't going up.

Although correct me if I'm wrong, but I don't think there's any bonus for completing the challenge within 24h, and you can definitely do them "late" (and in any order if you have multiple active). So since you're going to get 30 skeletons anyway at some point, I think you're best off ignoring the challenge and just collecting whatever your next campfire target is.