https://www.polygon.com/2018/7/12/17564324/fallout-new-vegas-no-killing-hardest-difficulty-playthrough

A Fallout: New Vegas fan recently completed a run that can best be described as taking the path of most resistance. YouTuber Rheteam beat the game, beat the game on its highest difficulty, beat the game with a hardcore survival conditions mod enabled, beat the game with permadeath (so he couldn’t die), beat it without killing anyone and beat it without firing a gun. Oh, and no companions, either.

It took him since March over a span of 19 episodes (about one hour each). Here is the finale (spied by PC Gamer), which wrapped up two days ago: