Here is the full list of all 50 Black Book achievements.
Become a mistress of Hell
Succumb to Dark forces
Collect 4 copies of each card
Compose a spell out of 13 words
Don't release the Mermaid
Acquire 100 sins
Complete Chapter 7
Meet your beloved one
Unlock all the words
Unlock all the black words
Break all the seals
Complete Chapter 6
Retrieve the Book
Collect 70 encyclopedia entries
Complete Chapter 5
Collect all the songs
Read 77 entries in the Onomasticon
Win 3 times in a card game while cheating
Collect 50 bailichkas
Visit 333 locations
Complete Karnysh loyalty quest
Talk with 100 characters
Complete Chapter 4
Find all the clues in Nemzya
Gather 66 herbs
Complete Chapter 3
Collect 30 bailichkas
Take seven demons to your service
Answer 40 Knowledge questions
Guess the road in the cursed forest
Complete Proshka loyalty quest
Complete Chapter 2
Release the Mermaid
Complete Old Egor loyalty quest
Cow level
Gather 33 herbs
Release seven dead men
Collect 30 encyclopedia entries
Complete White Head loyalty quest
Answer 25 Knowledge questions
Win 5 times in a card game
Negotiate with Susedko on Zemskaia station
Guess all the Obderiha riddles with the first attempt
Complete Chapter 1
Collect 10 bailichkas
Complete Nikolay loyalty quest
Gather 13 herbs
Answer 10 Knowledge questions
Collect 10 encyclopedia entries
Complete the Prologue