I take no credit, but the following walkthrough has all collectables and solutions to all puzzles in it:
http://www.gamehouse.com/blog/2016/02/eventide-slavic-fable-...Only achievement you won't get from following the walkthrough is
so make sure to talk to all characters in chapter 2 when you get in the basement.
With that walkthrough I was able to complete the whole game in 3 hours (skipping all cut scenes).