Forum:Scourge of humanity bugged?

So I've played the game with an evil twist since day 1... very evil. Killing innocent civilians, stealing everything, saying really mean things in chat, etc. However, when I hit level 20, instead of the scourge of humanity achievement, I got the last best hope of humanity achievement. Is it possible to have such negative karma that it actually loops? If not, somehow I found a bug. Has anyone else had this happen to them?