I think that it would be nice if you gave a badge for finishing all the side quests up to dragonspyre, then from celestia to krysylis.
There are badges already that cover this although they're awarded for completing ALL quests in each world. Examples of this are "Savior of Wizard City", "Master of the Oasis" and "Mooshu Champion". There are similar badges for all of the other worlds too.
