I have all the fossils, and I just need 1 bug (that dang tarantula!!!! I got stung like 3 times...), 1 fish, 1 diving fish, and like 3 pieces of art...badges tho...
In both WW and NL the bug catching has always been my favourite thing to do in the game. However I've never 100% the bug collection! I am very close at the moment (although the most I am missing are some September/October time so I have a while to wait before finishing it)
I haven't played WW in a few years (especially since I got NL) however I had a look at it last week to see how it was doing these days. For some reason I had a fossil in my pockets (why did I stop playing so suddenly?) so I thought I'd donate it. To my surprise, Blathers accepted it and then told me I've completed my fossil collection! I can't believe I've had a fossil in my pockets for that many years, and then when I finally donate it, it was the last one I needed! It was a bizarre experience.
I am 4 fossils away from completing my fossil collection in NL