well its possible but going to be a lot harder if you did not complete the pre-shattering quests. There are a number of quests that reset each year like midsummer & lunar fest quests that do contribute. when you faction change you will lose all your faction specific quests. I'm not certain if it will take away all your pre-shattering quests when you faction change again. there is also a bug where it will show 2 different values for your quest tracker depending on some factors which could be zone related. Mine seem to have abt a 400 quest difference.