Here is the full list of all 12 Pinstripe achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Catch 13 butterflies!
Beat the game in less than an hour!
Wear Mr. Pinstripe's suit!
Warm George up!
Be a complete butt head.
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!