Changelog for patch 1.0.1 / (Windows) / (Mac) / (Linux) (added 20 April 2017):

- Fixed rare issue that caused save file to be broken
- Fixed small spike trap not unlocking the vault entry sometimes
- Fixed a bunch of exceptions that were causing rare strange issues. Including some save progress loss
- Quest percentages don't click over to 100% until achievement is unlocked
- Fixed some narration lines not playing or playing twice in tutorial
- Tutorial popup now shows correct icon when using a controller.

Hope they will implement achievements on GOG, cause this is changelog from steam :-\

An oversight on their part most likely, as they have modified the changelog and removed that bit:
http://www.an-ovel.com/downloads/chg/chg_1207665263.htm