On my Horde paladin toon my achievement counter goes up to 270. I have to admit, this number is with store mounts and one epic spectral tiger from the AH (thanks Garrison for my first goldcapping ever!).
I still got no turtle and Nat Pagle mount from fishing, and also totally lost the motivation to fish at the moment. I am currently farming Invincible, Mimiron's Head, FL drop mounts etc. Badge mounts from TW will come to me in February. :3
I guess, the 300 achievement will be finished in Legion regarding my drop luck.