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