Beating all the (new) Hitman games - no murder challenge.
No murder means, by this guy's rules, he cannot directly cause someone's death through action, but, say, putting a banana peel at the edge of a cliff and then throwing a coin at it is fine, because the idiot going over there to pick up the coin and step on the COMPLETELY OBVIOUS BANANA is too dumb to live. Lots of that sort of thing. Lighting up cigarettes next to visibly leaky gas drums/propane tanks, etc.
Also note that "no murder" does NOT mean "no violence" because I lost track of the number of mooks clubbed into unconsciousness with a banana.