Here is the full list of all 10 Sinful Catalyst CH1: Ethereal Camellia achievements.
Go with Ravi and try to escape from the second circle.
Go with Devi and search for Lilith.
Defeat Lilith in your first encounter.
Destroy the rabbit that is controlling Ravi.
Destroy the slime that is pampering Devi.
Find the hidden camellia in Lilith's room.
You know... with Lilith.
Discover the secret scene.
You have become a butler of Lilith for eternity.
Defeat all waves of butlers.