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.
Wear Mr. Pinstripe's suit!
Find all three secret rooms!
Get the Tommy Gun!
Collect 1,000 Frozen Drops!
Beat the game without getting hurt!
Just be nice, OK?
Sniff out all the clues!
Kill every monster!
Catch 13 butterflies!
Warm George up!
Beat the game in less than an hour!