Merciful
Ultra rare0.4%StoryMissableStory complete
You finished the game without killing anyone (except Runt, but he had it coming).
Don't kill anyone (except Runt, who you have to kill to progress the story). You can use your fists and blunt weapons to just knock people out - just make sure not to kill them. Also go for stealth kills where you can. You can track # kills in the game stats window - which should stay at zero until Runt, and then 1 from the point you kill him through to the end of the game.