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