There are a few bugged/missing achievements.
• The level 90 achievement is missing from the game under the general tab, the last one is for level 80. Traditionally every expansion has had this. Currently only the Warband achievement of hitting 90 exists but War Within also had both the Warband and the normal hit max level achievement.
• The Ultimate Predator to kill all Voidstorm rares is not account-wide progress unlike the other zone achievements to kill rares
• Abundance: Artisan, Abundance: Investor and Abundance Professional do not seem reasonably achievable even using a large group