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