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