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