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.
Better than unknown sender
Unusual Maid Meeting
Too good to be true
Nobody would have expected that, huh?
It's true love
It really was an accident
Unusual mature but maybe the right choice
Nobody knows you better than them
Dark secret
Or the right opportunity?
You might have fallen for her mask
Get your reward for behaving
Now that you know the truth