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