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