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