Here is the full list of all 19 YOHANE THE PARHELION -BLAZE in the DEEPBLUE- achievements.
Earn every other achievement
Reached the ending
Completed You's quest
Completed Mari's quest
Completed Ruby's quest
Completed Hanamaru's quest
Rescued Mari
Rescued Ruby
Completed Dia's quest
Completed Riko's quest
Rescued You
Rescued Hanamaru
Completed Kanan's quest
Rescued Dia
Rescued Riko
Completed Chika's quest
Rescued Kanan
Rescued Chika
Began Yohane's new adventure