There is a very easy way to tell the normal side quests from the quests that open up the Moogle tribe quests.

Go to the Churning Mists, change to a crafter job, and open the map. All the normal side quests disappear (since they are fighter quests), while the current quest for the Moogle tribe is still visible. You cannot do this quests as a crafter (you still have to fight), but this is a very easy way to find out what to do next to finally activate the Moogle crafting quests.