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