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