Here is the full list of all 32 Nyasha Winter achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
GameOut
Miu Hight
Choko Hight
Ayana Hight
Kameko Hight
Ayame Hight
Momoko Hight
Hikeru Hight
Mika Hight
Shizuka Hight
Ume Hight
Miu Normal
Choko Normal
Ayana Normal
Kameko Normal
Ayame Normal
Momoko Normal
Hikeru Normal
Mika Normal
Shizuka Normal
Ume Normal
Miu Easy
Choko Easy
Ayana Easy
Kameko Easy
Ayame Easy
Momoko Easy
Hikeru Easy
Mika Easy
Shizuka Easy
Ume Easy
GameOn