Currently games can be registered as beaten (referring to main objective) or completed - completed seems to infer 100%, but there are plenty of games I played through 90% of, or at least completed all the in game material like side stories, etc, rather than simply mainlining the main story part - being able to specify this middle ground would be cool.
In essence, breaking up status into something like:
beaten (you beat the game, just getting the bare minimum done - nothing wrong with that!)
completed (you enjoyed the game and went out of your way to experience all the game had to offer!)
100 percented (you stuck in there and squeezed out every possible drop of gamer juice you could get out of the game)