i've completed leon and chris's campaign, i decided to play ada's campaign before jake's. But i can't obtain ada's chapter 5 trophy, even though i already beat it. So i have to complete jake's campaign first and come back to ada's chapter 5 later?
I would have thought you get it upon completing her chapter. Maybe it was originally made to register upon the completion of all chapters instead of Ada's chapter five. So completing all of Jake's chapters will get you that trophy I'm guessing.