Finishing pet battles achivs (did all the families except Dragonkin Brawler).
Doing Alliance War Campaign and getting reputations for Kultirans + Dark Iron Dwarfs
Wsg brawl to get last 10 wins and exalted reputation.
After this planning to do all Legion professions, and maybe some M+ dungeons for achivs, also doing LFR for transmog achi
Tldr; achievements
Like hundreds more things to do in Retail. More balanced classes, actually challenging dungeons/raids. Classic...no thx