Here is the full list of all 15 Sakura MMO Extra achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Two girls with too much energy
Everything has to be perfect
A knight at heart - not a maid
Is that really it?
You were not the only one thinking about it
Bonnie warmed up to you
Probably not the easiest job change
Meet an old friend
Or a new service
Hugged out of trance
...or a magic spell?
Let Holly and Aislinn help out
Review Eleri's and Fion's maid outfits
New piece in the wardrobe
Leaving was never an option