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