Here is the full list of all 16 Hatoful Boyfriend achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
Get Sakuya full ending (ED no.03)
Get Nageki ending (ED no.04)
Get Ryouta ending (ED no.01)
Get Kazuaki ending (ED no.08)
Get Bad ending (the hawks party killed you)
Complete Torimi cafe story (ED no.12)
Get Sakuya ending (ED no.02)
Get Yuuya ending (ED no.05)
Get Okosan ending (ED no.06)
Get Okosan full ending (ED no.07)
Get Shuu ending (ED no.09)
Get Shuu ending (ED no.10)
Get Anghel ending (ED no.11)
Get Azami ending (ED no.13)
Get BBL ending
Get the BBL epilogue (unlocked by getting all 14 endings)