"Win a T round without killing anyone" is a bad idea TBH because that's essentially the same as a Traitor not Traiting. Encouraging someone to NOT play the game or help their team is not a great idea.
This has been suggested and shot down several times. Highwon does not want achievements or quests, at least, he didn't in the past. This may have changed, but I want to make it clear that even if there is support for this it may end up being denied. That being said i'm pretty indifferent. It could be cool, but it may be annoying to code and keep up with.