Here is the full list of all 13 Boarding College 2 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
FP2!
FP1!
Teachers affair ending!
FA2!
FA1!
F Lexi P!
x2 Lexi!
I-charlotte, Lexi-me!
F Charlotte A!
You two-me!
Charlotte part 2 ending!
Let them decide!
Lexi-Us!