Check this link to find the 106 secrets in the game, all is explained well with pictures, I got the trophy while I was following this guide, I never had a problem to find one of the secrets, just read carefully what is explained.
> steamcommunity.com/sharedfiles/filedetails/?id=181585906
Sorry, I don't know how to put this link "active". Just copy it on your Internet navigator.
Credits are for the creator of this guide.