This is a fun time-management type of game. This game is extremely easy to get 100% because the achievements also unlock on easy mode in which you have no time limit at all. ~10h for completion.
Approximate amount of time to 100%: 10h
Estimated achievement difficulty: 2/10
Minimum number of playthroughs needed: 1
Is there a good guide available: No, but you won’t need a guide
Multiplayer achievements: No
Missable achievements: No
Grinding Achievements: No
DLC-Only achievements: No
Time-gated achievements: No
RNG-achievements: No
Does difficulty affect achievements: No, you can play on easy without time limit and still unlock every achievement
Unobtainable/glitched achievements: No
This is a fun time-management type of game. It has 65 levels and you start with one worker that has to do some task to finish the level, but in almost all levels you can get more workers by upgrading the camp or summoning one with the altar.
This was the first “Viking Brothers” game I played, so I can’t compare it to previous titles in the series.
This game is extremely easy to get 100% because the achievements also unlock on easy mode in which you have no time limit at all. You’ll have to play through the main campaign and the bonus levels. I completed it in 10h but might be able to do it faster.
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Developer: 
This review is written on 25 September 2019 based on the Steam version which has 44 achievement when I write this review. The information can be outdated when developers add or remove achievements.