For anyone, detailed walkthrough in Slovak language, but it can be helpful even to others.

Furthermore, four achievements, which are commonly missed are stated in the last video.
-Enlightenment
-Little Monk
-Dark Knight
-Little Warrior

Playlist: https://www.youtube.com/playlist?list=PLaRCgWPINPjO9-XThFR0XWLko-vpzNkus
Achievement video: https://www.youtube.com/watch?v=m7YU6GqwFAM&list=PLaRCgWPINPjO9-XThFR0XWLko-vpzNkus&index=8