Here is the full list of all 18 Hermitage: Strange Case Files achievements.
Successfully completed Chapter 1
Successfully completed Chapter 2
Successfully completed Chapter 3
Successfully completed Chapter 4
Successfully completed Chapter 5
Successfully completed the final ending
Reached the bad ending of Chapter 1
Reached the bad ending of Chapter 2
Reached the bad ending of Chapter 3
Reached the bad ending of Chapter 4
Reached the bad ending of Chapter 5
Reached the bad endings of all chapters
Completed the first deduction
Unlocked all the intelligence pieces in game
Unveiled all secrets of the abandoned factory
Reached the final ending in no more than 5 ponderings
Watched all the TV programs in game
Browsed all the forum posts in game