I need more secrets to unlock the last Riddler's
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It's 400 You simply have to collect all of them as batman (like in AA where you had co collect all to get the riddler arrested). Physical challenges, riddles, trophies, cameras, destroyable objects, tyger camera panel and physical challenges do all count.
And no, Catwoman's trophies are not needed, you can still do it without the dlc installed, I don't know if they do count towards the 400 if you collect them though, because I only started collecting them after I had already done so with Batman.