Beautiful but very emotional story. The game looks lovely and has a nice way of telling the story. It has many missable achievements and takes around 7h to complete the game.
Approximate amount of time to 100%: 7 hours
Estimated achievement difficulty: 3/10
Minimum number of playthroughs needed: 1, maybe 2 because of the missable achievements
Is there a good guide available: Yes here
Multiplayer achievements: No
Missable achievements: Yes, a lot. I recommend using a guide if you don’t want to have to play twice through the game.
Grinding Achievements: No
DLC-Only achievements: No
Time-gated achievements: No
RNG-achievements: No
Does difficulty affect achievements: No
Unobtainable/glitched achievements: No
What a very sad story, but a wonderful way to tell it with amazing artwork! Enjoyed this game a lot.
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Developer: 
This review is written on 13 May 2018 based on the Steam version which has 21 achievement when I write this review. The information can be outdated when developers add or remove achievements.