It wasn't so hard at all. Thanks to Fander for orienting me in right direction at the very beginning of the game; thanks to Klar for creating those games.Still some details, not so good as they can be, even with patch 1.3a.
-bathhouse quest remains in active questlist after quest is done and delivered to innkeeper; if he gave me any reward, I didn't noticed that.
-after Njam already imprisoned, some mess with Jarls: all of them were at their Jarlhouses, even Markel, but not Tryygva in Frosgard.
-part of Connecting Tunnels, leading directly to Yorwick village disappeared from the map and won't appear after I entered the Tunnels from Yorwick side.
-some mess with Njam's house key: Krohn gave it to fourth character, I later moved it to 1st character but was unable to open Njam's house door with 1st, only with 4th character (still without key in his inventory).
-I led all the children in Yanmir's Fort till the teleporter to Frosgard and .... nothing happens. They still remaind in the Fort.(Maybe they were waiting for lunchtime). But this one probably were as it is supposed to be.