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