Webbed

While this trophy isn't missable, you want to make sure you get Virtuous  first to avoid having to play a second playthrough for that trophy. Just to be more clear, in order to get that trophy first, do not eat a single firefly until after you've completed the story and Virtuous  has unlocked. This trophy is marked as unmissable purely for that reason as it coincides with Virtuous . While that one is missable, this one can still be cleaned up at any point during or after the story has been finished.

For this particular trophy, you need to eat all 48 fireflies in the game. They are located in the Bee (rightmost) and Dung Beetle (leftmost) areas. The fireflies are found in the Bee (rightmost) and Dung Beetle (leftmost) areas. They're the bugs that fly around that you'll need to catch in a web, then press  to eat:

If you're having any trouble, please refer to the maps below showing which sections the fireflies are found in and how many are in each [section]. When you've gobbled up every firefly, make your way back to the central tree and just off to the left of it will be a fairly large fly sitting on a stump (or more so hovering over it).
 

Talk with the fly and in his sheer bewilderment on your evilness against his own kind, he'll give you a sticker (required for Collector ) and this trophy will unlock.

The locations of all of the fireflies are as follows (the areas they're in are highlighted in red):

Bee Section:
 

Dung Beetle Section: