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