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