Here is the full list of all 31 Dream Date achievements.
Outdoor hot spring with mixed bath
Sensitive idol
Unlocked Yurui's CG
Have all of Yurui
The idol of hard work
Be strongly kissing
The idol is sick
This soda is all over the place!
dol is the king of the stomach!
Unlocked Rina's CG
Have all of Rina
Skilled Rina
Super size idol
Rina is jealous
Active Rina
Is Rina on purpose？
Reward after cleaning?
Feeding of Rina
Unlocked Kashima's CG
Have all of Kashima
Dispel the uneasiness of Kashima
Win the favor of Kashima
What kind of uniform？
Find the kitten again
It's a real kiss
First touch
Find the kitten
Welcom to Dream World