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.
Use a hint in game
Yokai's Secret
Get all stars from Draculea
Get all colors back
Draculea's Secret
Meet Draculea
Get all stars from Kinutanuki
Kinutanuki's Secret
Meet Kinutanuki
Get all stars from Amanozako
Amanozako's Secret
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
Ouni's Secret
Meet Ouni
Ungaikyu's Secret
Get all stars from Ungaikyu
Meet Ungaikyu
Ichiko's Secret
Get all stars from Ichiko
Meet Ichiko
Kuda's Secret
Get all stars from Kudagitsune
Meet Kudagitsune
Open the friend book(please install free DLC)
Atake's Secret
Get all stars from Atake
Meet Atakemaru
Kane's Secret
Get all stars from Kane
Meet Kanedama
Neko's Magic
Neko's Secret
Get all stars from Neko
Meet Neko
The Story
Yokai's Encounter