A friend of mine just got his last ribbon today, trying to find out when he last played. Maybe it's updated recently today, but he's offline ATM so can't find out.
344 completed games & apps to 100%
91.58% completion percentage
Last 100% Completion : Slender: The Arrival (1000g) (Xbox One)
Thanks to Rajeanero for the avatar and Fishman for the sig.