I would love if the daily and monthly achievements had some sort of variety rather than do the same exact things for it every day/month.
Like one day it could be crafting related where you have to salvage 25 items and make 25 items. The next day it could be kill 100 mobs and kill 15 different types of mobs. The next day could be something like doing the keg brawl. Another could be something like do 5 events in 5 different zones.
Adding variety to the daily achievements would encourage people to do other things they may not have tried yet rather then the same few tasks every day.
Would also be cool to have weekly achievements as well.