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
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!
Super size idol
Skilled Rina
Have all of Rina
Unlocked Rina's CG
Rina is jealous
Active Rina
Is Rina on purpose？
Feeding of Rina
Reward after cleaning?
What kind of uniform？
Dispel the uneasiness of Kashima
Unlocked Kashima's CG
Have all of Kashima
Win the favor of Kashima
Find the kitten again
It's a real kiss
First touch
Find the kitten
Welcom to Dream World