Assuming 2910 is max as people say it is with those glitched ghosts it is definitely possible to achieve max grimoire. I played with a dude today that was 1 card off of 2910. And the card was attainable.
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You know, it hadn't occurred to me that I should probably change the title after the update that fixed all the bugs with the grimoire. That being the 1.1.1 update. Ive had this thread open for awhile. Chances are the only reason the grimoire can now be completed 100% is because of this threads creation. Ive seen a max grimoire and its 2950 I believe. Since you play on xbox, chances are that xbox's max grimoire is 2910 while Playstations is 2950 (Note: I could be wrong here, just going off what I remember). Thank you for your comment and making me realize I should probably rename the thread to something more appropriate :P