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