Here is the full list of all 21 Vampires' Melody achievements.
Welcome to Vampires' Melody
Complete Prologue: An encounter
Complete Chapter 1: Waking up from a Dream
Complete Chapter 2: Survival
Complete Chapter 3: Nowhere to Stay
Complete Chapter 4: The Line between Life and Death
Complete Chapter 5: Decision
Complete Chapter 6: A Beautiful Moment
Complete Chapter 7: If this second lasts...
Complete Chapter 8: New World
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Normal people wouldn't believe it
Do Not defy the law
Three shots and six holes
The end of the sea
The rain that never ends
Lonely exile
Another new world?
The winner in life
Nothing, and everything
Earth and Ether