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 the BBL epilogue (unlocked by getting all 14 endings)
Get BBL ending
Get Sakuya ending (ED no.02)
Get Yuuya ending (ED no.05)
Get Okosan ending (ED no.06)
Get Ryouta ending (ED no.01)
Get Shuu ending (ED no.09)
Get Shuu ending (ED no.10)
Get Bad ending (the hawks party killed you)
Get Okosan full ending (ED no.07)
Get Anghel ending (ED no.11)
Get Azami ending (ED no.13)
Get Kazuaki ending (ED no.08)
Complete Torimi cafe story (ED no.12)
Get Sakuya full ending (ED no.03)
Get Nageki ending (ED no.04)