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