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 Bad ending (the hawks party killed you)
Get the BBL epilogue (unlocked by getting all 14 endings)
Get Azami ending (ED no.13)
Get Shuu ending (ED no.10)
Get Okosan ending (ED no.06)
Get Sakuya full ending (ED no.03)
Get BBL ending
Get Ryouta ending (ED no.01)
Get Kazuaki ending (ED no.08)
Get Okosan full ending (ED no.07)
Get Sakuya ending (ED no.02)
Complete Torimi cafe story (ED no.12)
Get Shuu ending (ED no.09)
Get Anghel ending (ED no.11)
Get Yuuya ending (ED no.05)
Get Nageki ending (ED no.04)