Here is the full list of all 13 Catgirls From My Sweet Dream achievements.
Date with Sakura
Taste Milkshake
Date with Miyuki
Taste Chocolates
Date with Agnia
Untie red ribbons
Visit Yumeko's Store
Compromise
Speak with Lady Haruka
Adventure begins here!
Collect 100 stars
5000 crystals in the wallet
Buy a return ticket