Ya, so what's your character's biggest accomplishment (besides being Dragonborn) Recently I completely ripped The Ebony Warrior to pieces. Not literally, but I did finish him off with the warhammer head butt move. Let me hear yours!
I stole the weapons of every guard and citizen of solitude, stashed them all in a chest in the wilderness and started a crime spree.
It was fun, everyone punching me while I murdered and stole everything in the city.
I killed both kaarstag and the ebony warrior on legendary without healing with my paladin (and without exploits)
he hit the armor cap, the block cap and absorbed 80% of the spells throw at him - he was overpowered as hell.
My character abused alchemy and enchanting to get all the perks in the game. But it's so easy it's not much of an achievement. Just time consuming. Unfortunately, I have done the typical achievements so many times in game I don't quite like doing them anymore.