Ok, I finally got "Going Crazy", and "Achievement Hunter" too, so 43/43 at last.
@itichi: it is not where we thought, you have to get it in the second part. I advise not to go for it, it's hidden, very hidden. When it is more public, I wll suggest them to change the description of the achievement, because no it's so confusing.
You devs are ... this achievement nearly harms my sanity ;-) Apart from that, you made an awesome work. Congratulations. And please, keep going, we need a full game.
@Jones Damm: As I said, "Going crazy" is very hidden. "Keep track" is easier, you can get it even without looking for it. Don't know which hidden one is your last.