For this achievement, you have to have sex with all the demons next to the devil after each maze. This is miss-able if you went for Apple of Knowledge first. So if you missed this, just go to Chapter 3 and do each maze over again while having sex with each demon during the question phases with the devil. Once you get to the end, instead of having sex with the Devil, choose to ask more questions. 4 Q' Q, C% C+ W