Thanks, I'm glad you enjoyed it, that's awesome!
For the Well Traveled Challenge you'll need to visit each room twice. This DOES NOT include the circus, the Desert or the Lamp Cave, so just the North Field, South Field, The 3 Palaces and The Tower. If you've done that and it still hasn't/doesn't unlock than it might be a bug. I have received reports that various different Challenges aren't unlocking for different people. The Challenges gave us quite a bit of headache when implimenting them in game, so we did it as best we could, but unfortunately a few bugs slipped in and we can't isolate exactly what triggers them. Hopefully exploring each room twice works for you, if not I'm very sorry about that. As a completionist I know how frustrating it can be to see an incomplete task in a game