Stray has 67 Collectibles - 27 B-12 Memories, 6 Badges, 8 Sheet Music, 12 Scratch Points (only 1 per Chapter needed), 10 Nuzzles, 4 Energy Drinks (exclusive to Chapter 4). This 100% guide also includes miscellaneous trophies and story items (21 total), bringing the total count to 88 Items needed for 100% Completion.
Finding all collectible locations unlocks the following trophies:
Meowlody - Bring all the music sheets to Morusque.
Cat's best friend - Nuzzle up against 5 robots.
I Remember! - Gather all B-12 memories.
Badges - Collect all badges.
Territory - Scratch in every chapter.
None of the Collectibles are missable. You can still get everything via Chapter Select after the story. Everything can be replayed.
You can keep track of how many Memories you find in Chapter Select and the Inventory. Music Sheets and Energy Drinks also go in your inventory and can be tracked from there. Badges will stick to the cat's backpack to keep track. There's no way to track in which chapters you scratched and how many Nuzzles you did. However, you only need 5 Nuzzles (there are more than that) and those also count when redoing the same ones via Chapter Select, they don't need to be different ones.
By following this video series you'll get all collectibles and chapter-specific trophies in 1 playthrough. Then you'll only have the 2h Speedrun left for Platinum.
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