Here is the full list of all 9 Devotion achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Collect all the notes
Complete chapter: Homecoming
Complete chapter: Devotion
Sit down and listen to Mei Shin's full performance
Complete chapter: Nostalgia
Recover secret hideout memory
Recover storybook memory
Recover Mei Shin relapse memory
Complete chapter: Doorways