Some of the Metal Gear Solid games should be able to be completed without killing people. You're still knocking out and beating up people, and you do need to destroy the Metal Gears themselves, but there are usually a lot of non lethal options.
I've only played MGS 1 but I think I heard that you could complete it without killing anyone, interesting.
reply
I don't think you can do it in MGS1, but I'm almost positive you can do it in 2 onward. I've never personally done it, but I try to use stealth and non lethal options whenever possible.
reply