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Also be patient, sometimes it takes 30-45 seconds until the trophy pops

I tested this save a bit , after entering the menu i got all trophies for collecting all weapons of each class (this will make platinum about 10-15 hours faster as you only have to collect documents and legends, no weapon kits!

Drive a bit for driving 100km trophy, use yout drone for using it 10 min trophy and so on

Complete a normal mission and you get the trophy for completing all missions

I havent tested yet what happens if you defeat a boss

Also i havent found a way to unlock collecting all documents/legends