Here is the full list of all 13 Catgirls From My Sweet Dream achievements.
5000 crystals in the wallet
Adventure begins here!
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
Collect 100 stars
Buy a return ticket