Finishing the MQ on the highest difficulty / lowest level you can manage without increasing / decreasing difficulty. Include, race, build (http://skyrimcalculator.com/ if you want), civil war, any guilds and difficulty.

Examples

Level 65 - Brenton - http://skyrimcalculator.com/178735 - Imperial - No Guilds - Master

Level 26 - Dunmer - Mage - Neutral - Winterhold - Adept

Level 19 - Khajit - Assassin - Neutral - TG, DB - Novice

Level 37 - Orc - http://skyrimcalculator.com/#178742 - Stormcloak - Companions - Master

Level 50 - Redguard - http://skyrimcalculator.com/178729 - Imperial - All Guilds - Expert

See my sig.
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My Dragon Paladin can play on Master consistently without every touching the slider. He has a lot of magic resistance, though. + Spellbreaker. Other characters that I don't focus on defensively (rp and whatnot) I tend to switch down to adept. Certain characters can handle most situations but throw in a Forsworn/any magic user really and things can get shaky.

I tried all difficulties ofcourse, but currently I play on master with my shield tank Nord warrior, when I play w/o RPing. When I RP, it all depends on how combat capable is my character. If my character is really hardcoe hero warrior, I will go with novice from start, and then I will raise difficulty as I level up.
My illusionist in RP is absolutely incompetent combat character, so that is why I play on master with him. It really depends.

Why did you ever play it on novice?
I first started on expert, then felt it was a little easy to level so I put it on master. I do not understand why anyone would go from novice and then slowly raise difficulty it makes you finish the game way to easy. Can just as well put "TGM" in console and finish the game that way.

I've always been playing on Adept difficulty since the start and never touched the difficulty slider.

I'm level 43 now, maybe I should increase the difficulty:P

I mean one playthrough one completion on the highest difficulty / lowest level you can manage. Just curious to see what people's finishing stats were for lowest level / highest difficulty played. Not starting from easy to expert. The lowest level I've played on was adept and I never change difficulty. My next run will possible be on master difficulty finishing the lowest level possble.

One does not simply "beat" a TES game.

Why lowest level possible?