Here is the full list of all 12 Pinstripe achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Beat the game in less than an hour!
Catch 13 butterflies!
Be a complete butt head.
Get the Tommy Gun!
Warm George up!
Wear Mr. Pinstripe's suit!
Find all three secret rooms!
Collect 1,000 Frozen Drops!
Beat the game without getting hurt!
Just be nice, OK?
Sniff out all the clues!
Kill every monster!