Here is the full list of all 26 Lunacid achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Reached the Prison
Reach Level 50
Reach the Castle
Reach the Grand Library
Slay an Abyssal Demon
Reach the Forest
Reach Level 25
Reach the Sewer
Reach the Catacombs
Reach the Lake
Reach Level 75
Find the Second VHS Tape
Wake the Old One
Reached the Ruined Arena
Unlocked all of Etna's alchemy recipes