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