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