All you have to do is go to the book shop and buy 4 books, then the trophy should pop. I have gotten every other trophy on that save so it might pop some other trophies for you idk. Also I no longer have the game so don't ask me for any more saves.
Probably won't work with OFW. Should work with CFW & Xploder. MUST DELETE PATCH FOR TROPHY
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this is the trophy that has glitched for so many people after the 1.02 patch...and ubisoft have not still fixed it yet..dont know if this will work though ill try. On OFW i have 100% legit on Revelations with all books purchased but no trophy or platinum.