I had to play through Sherlock Holmes and The Hound of The Baskervilles three times to get the last achievement (Golden Hound – for having all the other achievements), which would not unlock despite me indeed having all the other achievements, because my two games (normal and hard) were done on two different profiles and they needed to be done on the same one. And the only reason I needed to do more than one anyway was that apparently finishing it on hard does not count as finishing it on normal.. what? That and the “finish 10 hidden object puzzles in under 3 minutes each” achievement is dumb since you get no feedback to tell you if you fail.
Oh, and I couldn’t find the actual save game file, no idea where it’s hidden, so good luck to you if you mess up! I did find the save game screenshot thumbnail folder (inside %appdata%\roaming\frogwares\sherlock holmes and the hound of the baskervilles), and when those thumbnails were deleted/restored, it messed up and broke my existing test profiles, so that was fun too. My profile reset to a player name of “Katy” or something just before it broke completely. I wonder who that is.