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