If there's anything that's "above and beyond" the reach of most anybody, that is surely it. My measures are flexible for the games, but for that... "Beaten" would be finishing the game in any way at all without the insanity of the X-operations, "Completed" for clawing one's way through those as well.

I tended to use "Mastered" if I'd written a reasonably comprehensive guide to a game, though I haven't done that in a number of years now.