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...
Impress the House Party Guests.
Start your Adventure with Diana.
Get Proposed to by Andrew.
Obtain True Power.
Be Baptized by Angels.
Go To Paris with Naomi.
Be Eaten Alive by Diana's Pit Beast.
Prove Your Love to Suzu.
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.
Get Shot in the head by Malix.
Find Harold Anderson's Magic Books.
Dodge Malix in time.
Rename the Main Character.
Obtain True Freedom.
Unlock the Second Set of Bloopers!
Fight Malix Yourself.
Unlock the First Set of Bloopers!
Prologue Completed!