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