Here is the full list of all 25 Sakura MMO 3 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Don't slack off
Massage to loosen up
No mercy in training
Get to know Bonnie
Capturing Denied
Not solidarity
Mysterious godlike creature
Combined skills
Find endless knowledge
Reach solid ground again
Don't remind her
Hidden in plain sight
Meet the goddess iona
Don't look into it
See her true will
Choose to fight
You chose whipped cream over chocolate?
You chose chocolate over whipped cream?
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Finally
Choose Eleri
A familiar feeling
You may kiss the bride
And a new experience
It's been a while