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