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