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