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