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