Here is the full list of all 50 Seduce Me 2: The Demon War achievements.
Become Victim of Revenge
Die At The Hands of the Spirit
Experience Erik's Eternal Devotion
Diana Rules the Demon World
Perish Centimeters From Your Love
Fail The Dragon's Test
Use Blood Magic against the Demon Lord
Begin Erik's Story
Become Baptized by Saero
Share Diana's Love with Saero
Keep Ezaeur Forever
Begin Diana's Story
Lose your Trainer
Return Home with Sam
The Four Rebel Leaders Work Together
Rule The Demon World with Aomaris
A Gift From Hell
Become Queen of the Demon World
Trap the Demon Lord Without Bloodshed
Begin Sam's Story
Experience More of This Story
Meet K, your guide!
Begin James's Story
Begin Matthew's Story
Begin Damien's Story
Become Lost in Destiny
Witness The Last One Standing
Have him a Demon Forever
Defy Destiny with James
Welcome New Joy with Matthew
Live a Human Life with Damien
Help True Love Prevail for Saero and Ezaeur
Mourn The Death of the Rebel Queen
Betray the Rebel Queen
Rabbit Rules the Demon World
Fae Rules the Demon World
Shadow Rules the Demon World
Sergeant Refuses to Rule
Go Through the Brute's Test
Learn Shadow's Secret
Get Away from the War with Fae
Witness Inequality
Let Saero Search for the Rose
Learn of Saero and Ezaeur's Fate
Obtain an Angel's Forgiveness
Be Sentenced by an Angel
Put Trust in a Killer
Give Your Life For Damien's
Watch Your Love Burn
Experience The Story For the First Time