Here is the full list of all 25 Seduce Me the Otome achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Preview the start of Seduce Me 2: The Demon War!
Witness Simon's Transformation with Diana and someone special...
Be Baptized by Angels.
Get Proposed to by Andrew.
Get Proposed to by James.
Give Damien his Humanity.
Turn down sex, but keep your true love.
Accept Sam for the Man he is.
Share some Cake with Matthew.
Kiss Erik under the Moonlight.
Obtain True Freedom.
Prove Your Love to Suzu.
Go To Paris with Naomi.
Impress the House Party Guests.
Obtain True Power.
Get Shot in the head by Malix.
Find Harold Anderson's Magic Books.
Dodge Malix in time.
Be Eaten Alive by Diana's Pit Beast.
Start your Adventure with Diana.
Unlock the Second Set of Bloopers!
Fight Malix Yourself.
Unlock the First Set of Bloopers!
Prologue Completed!
Rename the Main Character.