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.
Obtain True Power.
Get Proposed to by Andrew.
Go To Paris with Naomi.
Obtain True Freedom.
Prove Your Love to Suzu.
Start your Adventure with Diana.
Be Eaten Alive by Diana's Pit Beast.
Give Damien his Humanity.
Find Harold Anderson's Magic Books.
Share some Cake with Matthew.
Get Shot in the head by Malix.
Fight Malix Yourself.
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.