Since it's well after the initial release, I decided to create an official walkthrough of the mod revealing all puzzle solutions and all Achievement locations.
However, my initial reason for including Achievements was a small YouTube sub-section of Amnesia community. These "Puzzle Solution" or "Walkthrough" channels are the perfect audience for this sort of content. Achievements are not mandatory and most people will miss at least one of them. That's where these channels could shine, showing the full walkthrough. But to my surprise, there was no walkthrough. And so, here's my own.