Here is the full list of all 15 Sakura Forest Girls achievements.
Achieve the Harem Ending
More than childhoof friends
Let the thoughts run over you
Whatever comes, you can do it together
Get Maia's Ending
Get ready for the ritual
Syncing mana levels
The stars contian so many stories
Those were not the proper sounds!
Not as light as she looks
She is supposed to be a witch?
Help your clumsy friend
Mika has an offer
No beauty sleep needed
It's just a dream