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