Here is the full list of all 49 Yokai's Secret achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Neko's Magic
Yokai's Secret
Use a hint in game
Get all colors back
Get all stars from Draculea
Draculea's Secret
Meet Draculea
Kinutanuki's Secret
Get all stars from Kinutanuki
Meet Kinutanuki
Amanozako's Secret
Get all stars from Amanozako
Meet Amanozako
Kawauso's Secret
Get all stars from Kawauso
Meet Kawauso
Get all stars from Akakami
Akakami's Secret
Meet Akakami
Kurage's Secret
Get all stars from Kurage
Meet Kuragenohinotama
Kinoko's Secret
Get all stars from Kinoko
Meet Kinoko
Get all stars from Ouni
Meet Ouni
Ouni's Secret
Ungaikyu's Secret
Get all stars from Ungaikyu
Meet Ungaikyu
Open the friend book(please install free DLC)
Meet Ichiko
Ichiko's Secret
Get all stars from Ichiko
Kuda's Secret
Get all stars from Kudagitsune
Meet Kudagitsune
Atake's Secret
Get all stars from Atake
Meet Atakemaru
Kane's Secret
Get all stars from Kane
Meet Kanedama
Neko's Secret
Get all stars from Neko
Meet Neko
The Story
Yokai's Encounter