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