AQ# stand for armor quest. You can get the armor quests after you reach lv 20 and complete your sub-class quest. There are 6 total, 1 being gloves, 2 being bracers, 3 being boots, 4 being shoulders, 5 being leggings, and 6 being chest armor. This armor is attunable, and as with all attunable armor, it cannot be traded after being attuned. From what I have heard, all of the AQs for the same armor type ( very light, light, medium, and heavy ) are the exactly same or very similar. Therefore, a templar and a gaurdian would have very similar AQs. Some of the AQs are fairly easy, but others seem much harder, especially when you need to go to a zone where not many people go, like the Crypt of Betrayl. Generally, all classes need a group for some part of each AQ.