Here is the full list of all 17 Leviathan: The Last Day of the Decade achievements.
You are the man of disgusting deeds.
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've got an old Oliver Vertran's photo.
Some new clues and a new enemy! It seems you investigation goes well.
You know Kroistham subway well.
Fistful and pockets of gold! Yeah, you are the real Orvood heir.
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!
Kristian told you about his dog.
You've found more than you ever wished for at the Kroistham Archive.
You tasted all the potions made by the vending machine.
It seems, Ruth thinks that you are special, so you deserve something more than friendship.
You took away the gargoyle's heart.
Sometimes your sister reminds you about the things you'd like to forget.
Now you know how that story began.