Okay, after using up all my vacation days, completing two achievements and three weeks of holiday, I found all except the Walking Stick. I couldn't take it any more. I'd completed a Fishing Aspiration and the Base Fossil collection and all Granite Falls Fish, constantly collecting herbs, frogs and insects, getting the special sculptures and recipes... Even with one guy having the Book Of Life I couldn't manage it because the spawn is random. It's not like I didn't spend 12 hours straight - twice - fishing there on top of all that.
I just sank to the Hidden Objects cheat. Sometimes your time is more valuble.