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