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