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
Finishing 1 HO in more than 10 minutes
For not skipping any dialogs
For completing the game
Completing all puzzles without skipping
All HO without hints
For finding 300 objects
Finishing 10 HO in a row in less than 3 minutes each
For using telekinesis 3 times
For using materialization 3 times
For finding 200 objects
Finishing 5 HO in a row in less than 3 minutes each
Finishing 10 puzzles in a row without skipping
For using the speed ability 3 times
Finishing 10 HO in a row without a hint
Find 10 objects in 10 seconds
For finding 100 objects
Finishing 5 puzzles in a row without skipping
For using the perception 3 times
Solve 1 puzzle in more than 10 minutes
1 HO in less than 1 minute
Finishing 5 HO in a row without a hint
Finishing 3 HO in a row without a hint
Finishing 3 HO in a row in less than 3 minutes each
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
Finishing 1 HO without missing clicks
Solve 1 puzzle in less than 1 minute