Well this is how close I came to getting the platinum trophy. I am 4 collectibles away. There is no way to know which ones I am missing and every single icon
Hogwarts Legacy - How to get Chest in Room of Requirement - YouTube
Hogwarts Legacy Collection: All 140 Conjurations and where to find them | PlayStationTrophies.org
Room Of Requirement Treasure Chests - Hogwarts Legacy Guide