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