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