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