Here is the full list of all 17 Leviathan: The Last Day of the Decade achievements.
You've got an old Oliver Vertran's photo.
You've found some evil books made from human skin at the Kroistham severs!
The guard told you a story by Phill from Chancellery. What a thrilling shit!
You know Kroistham subway well.
It seems, Ruth thinks that you are special, so you deserve something more than friendship.
You speak, see and do no evil. No evil at all.
Fin
The maniac is jailed. Why do you feel so depressed and upset?
You tasted all the potions made by the vending machine.
Some new clues and a new enemy! It seems you investigation goes well.
You took away the gargoyle's heart.
Kristian told you about his dog.
You've found more than you ever wished for at the Kroistham Archive.
Sometimes your sister reminds you about the things you'd like to forget.
Now you know how that story began.
You are the man of disgusting deeds.
Fistful and pockets of gold! Yeah, you are the real Orvood heir.