Achievement for completing the Nuka-World DLC quest "The Grand Tour". You'll get the achievement after taking to Gage, even though the quest gets marked as completed before doing so.
The quest is available after completing "An Ambitious Plan". Just secure all 5 areas by completing their quests ( Kiddie Kingdom, World of Refreshment, Dry Rock Gulch, Safari Adventure and Galactic Zone) of Nuka-World and assign the gangs to the secured regions. If you finished, talk to Gage and you're finished.