Edit: A patch was made to the game; once you beat the main story you receive a camera which shows where collectibles are within a fairly large radius around you, making this achievement far easier. This should subvert the need for watching any of the videos but I'll leave them up just in case.
Thanks for the heads up @FruitofPassion.Here is an excellent video series* detailing each of the Places and Brains. There are time stamps for each item in the Show More notes.
The related playlist on Quick Guides YT channel is called "Psychonauts 2 100% Collectibles".
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https://www.youtube.com/channel/UC_k8qUvgIFLoODu370mLBoA/pla...Here's a google doc that uses images in case you'd rather have those instead of videos or use them as a supplement. Thanks to layzMich3l for pointing it out and to Jyak from the P2 Discord for creating it:
https://docs.google.com/document/d/1brszMl9RLbrGcf_HPtpKvNha...Some of these are quite tricky to find.
Some tips when looking:
-Go into that Brain's page in your menu and press
to look through your figments to see if there are any duplicate ones you've missed. That way when combing the videos you can just watch carefully to see when they pick up the ones you need. If it's a duplicate it may also help you narrow down the area it's in. For instance, if it's a banana in Bob's Bottles, look in palm trees on the islands (that banana drove me crazy, ha).
-If you haven't found any figments of a specific look (e.g. bottle, fern, banana, mouse, etc) then they won't show up at all in your menu so don't go looking for any 0/1 or 0/2.
-I also set the speed of the videos to 2x which was really helpful for speeding up the search process.
*Videos credited to Quick Guides