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