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 BBL ending
Get the BBL epilogue (unlocked by getting all 14 endings)
Get Shuu ending (ED no.09)
Get Shuu ending (ED no.10)
Get Anghel ending (ED no.11)
Get Kazuaki ending (ED no.08)
Complete Torimi cafe story (ED no.12)
Get Azami ending (ED no.13)
Get Okosan full ending (ED no.07)
Get Okosan ending (ED no.06)
Get Yuuya ending (ED no.05)
Get Nageki ending (ED no.04)
Get Sakuya ending (ED no.02)
Get Sakuya full ending (ED no.03)
Get Ryouta ending (ED no.01)
Get Bad ending (the hawks party killed you)