Here is the full list of all 24 Volume achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Go invisible 30 times in core levels
Wear a disguise 100 times in core levels
Fire 40 figments in core levels
Fire the bugle 50 times in core levels
Stun enemies 100 times in the core levels
Play a level with a customized character
Complete all core levels
Read 100% of the text in the core levels
Use every gadget in the core levels
Die 200 times
Complete 75 core levels
Read 75% of text in the core levels
Place 20 follies in core levels
Be seen by enemies 300 times in the core levels
Die once
Complete 50 core levels
Read 50% of text in the core levels
Jump 25 walls in the core levels
Hide in 50 lockers in the core levels
Travel 3 miles
Complete 25 core levels
Read 25% of text in the core levels
Play for 20 minutes
Travel 1 mile