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