Here is the full list of all 13 Sakura Sadist achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unusual mature but maybe the right choice
Nobody knows you better than them
You might have fallen for her mask
It really was an accident
Now that you know the truth
Or the right opportunity?
Get your reward for behaving
It's true love
Dark secret
Unusual Maid Meeting
Better than unknown sender
Nobody would have expected that, huh?
Too good to be true