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