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