Don't know of a way for every title but you can look at games in your collection by going to:
AmberTax1327278's Game CollectionAnd then use 'View and Filter' at top right and selecting 'Gamers Completed' on the right side of the drop down menu. Then you can look through your collection with a view of the number of completions etc. Maybe somebody else knows a way of doing this with all Xbox games but afraid i don't.
Hope it helps anyway