Here is the full list of all 32 Sherlock Holmes and The Hound of The Baskervilles achievements.
For collecting all the achievements
For completing the game in hard mode
Completing all puzzles without skipping
Solve 1 puzzle in more than 10 minutes
Finishing 1 HO in more than 10 minutes
For not skipping any dialogs
For completing the game
All HO without hints
For finding 300 objects
For using materialization 3 times
For finding 200 objects
For using telekinesis 3 times
Finishing 10 puzzles in a row without skipping
For using the speed ability 3 times
Finishing 5 puzzles in a row without skipping
Finishing 10 HO in a row without a hint
Finishing 10 HO in a row in less than 3 minutes each
Finishing 1 HO without missing clicks
For finding 100 objects
For using the perception 3 times
1 HO in less than 1 minute
Finishing 5 HO in a row without a hint
Find 10 objects in 10 seconds
Finishing 5 HO in a row in less than 3 minutes each
Finishing 3 HO in a row in less than 3 minutes each
Finishing 3 HO in a row without a hint
Finishing 3 puzzles in a row without skipping
For using the power ability 3 times
For completing the tutorial
Find 3 objects in 3 seconds
Finishing 1 HO with less than 10 wrong clicks
Solve 1 puzzle in less than 1 minute