I've completed a playthrough where I collected all the chests. I used the RetroArch counter to double-check my progress. It's highly unlikely that the achievements author and I missed any chests. Perhaps the game is still hiding something. But I'm absolutely certain about the number of locations.
I've got a modded version of the game that lets you fly through walls and has several types of invincibility. Are you interested?
I've got a modded version of the game that lets you fly through walls and has several types of invincibility. Are you interested?