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!
Be Baptized by Angels.
Witness Simon's Transformation with Diana and someone special...
Get Shot in the head by Malix.
Obtain True Power.
Get Proposed to by Andrew.
Give Damien his Humanity.
Share some Cake with Matthew.
Accept Sam for the Man he is.
Kiss Erik under the Moonlight.
Get Proposed to by James.
Turn down sex, but keep your true love.
Start your Adventure with Diana.
Rename the Main Character.
Go To Paris with Naomi.
Find Harold Anderson's Magic Books.
Dodge Malix in time.
Prove Your Love to Suzu.
Be Eaten Alive by Diana's Pit Beast.
Obtain True Freedom.
Unlock the Second Set of Bloopers!
Fight Malix Yourself.
Unlock the First Set of Bloopers!
Impress the House Party Guests.
Prologue Completed!