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