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