[–] poopbutt 0 points 2 points 2 points (+2|-0) ago (edited ago)
Some quick googling suggests that a couple of people have managed to do it, and I vaguely remember one of the designers specifically mentioning that they fully intended for the game to be beatable (the main storyline, anyway) without killing anybody.
There's even an LP of someone doing it apparently, soo..
[–] hynieru 0 points 1 point 1 point (+1|-0) ago
http://gamerant.com/complete-fallout-vegas-without-killing-tao-51208/
Most fallout games are designed in such a way that no kill runs or near no kill runs are possible.
[–] strokavich ago
Many A True Nerd's Fallout New Vegas No Kill Run