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
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
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!
What kind of uniform？
Unlocked Kashima's CG
Have all of Kashima
Dispel the uneasiness 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