Gnothi Seauton Achievement in The Talos Principle II

*MISSABLE*

Note that the use of the Somnodrome and the dialogue choices you choose right after using it are highly impactful on who gets elected mayor, affecting three missable achievements. I therefore highly recommend you utilize the walkthrough linked in the roadmap before proceeding with this achievement.

I believe there is a prerequisite to this achievement, and that's that you must use the non-functional Somnodrome first. In N2 - Flooded Valley, the Lost Lab there has a Somnodrome, and you'll get some dialogue around it. You need to make sure you choose to plug in and try it. It'll break, but it is apparently required for this achievement.

Much later, when you get to W2 - Anthropic Hills, the Lost Lab there has another Somnodrome, but this time it's functional. Once again, you need to choose the dialogue option to plug in and check it out. This achievement will unlock after you finish and leave it. Note that your choices inside it don't matter for any achievements.