Why don't we get a badge when we beat the world of Celestia?
You do it is called Spiral Geographer. But you have to finish all quests. including the side ones. Before answering your question i checked my other characters. The ones who finished and the ones who didn't to see if they had a badge. Hope this helps you.
Can you be more specific on what you mean by "Beat" Celestia cause if you mean like complete all quests in Celestia there is one known as "Spiral Geographer" also this only counts in parts of the Actual Celestia so the Floating Land does not count for this badge Hope I helped! :D Fire is the True Balance!