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