For this achievement, you need to find all 30 Capcom Treasures. They are littered around the game. You can purchase the collectible maps for each of the areas at their respective safe houses.
There are technically 0 missable treasure chests because there is case select, but the only one that you can not backtrack to is the one in the prologue (1/30 in the video). You will need to select Case 0 to get this chest.
UpdateSimilarly, during case 4, there is a chest that is missable inside of the military base(28/30 in the video). You will need to load case 4 in case select if this chest is missed.
If anybody is looking for the location of any specific treasure chests, here is a video showcasing the locations:
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