This question already has an answer here:
- I have a Secret Hat 4 answers
Even after you earn them, secret hats refuse to tell you what you earned them for:
What's the point of the hat, if it won't tell me how I earned it?
This seems like a bug: The description should change from "this is a secret hat" to some real description after you've earned it.
This question is the more general case of this one: