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.
Start your Adventure with Diana.
Obtain True Power.
Find Harold Anderson's Magic Books.
Obtain True Freedom.
Get Proposed to by Andrew.
Go To Paris with Naomi.
Get Shot in the head by Malix.
Prove Your Love to Suzu.
Be Eaten Alive by Diana's Pit Beast.
Fight Malix Yourself.
Give Damien his Humanity.
Share some Cake with Matthew.
Accept Sam for the Man he is.
Kiss Erik under the Moonlight.
Turn down sex, but keep your true love.
Dodge Malix in time.
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.