AV and WSG usually you will get lucky and have teammates and an enemy working with you to cap and return.

AB can be a bit rough, but once I got my AB achievement, I did all I could to help my teammates get their achievements. The thing with AB is that usually that BG can really get competitive, so you have to do that one a bit more legit. The good thing about it is that, working together with teammates in a zerg, you can do a pre-made and help your friends out if you've gotten the achievement already.

EOTS is far and away the most awful, horrendous, impossibly horrific achievement I have ever seen in any game, MMO or not. Grinding away for 20 hours for a golden chocobo isn't as evil as that achievement. If you are horde, expect queue times to be 1 hour+ for that one. On top of that, you have to control the middle, and then fight enemies and live long enough to cap the flag. Oh, did I mention that often times you can be standing right on top of the damn flag capture point, with the flag in your hand, and your side controls the base, and the damn flag won't cap? If that happens, keep running on and off the flag capture point. It should cap eventually, but holy heck is that a stressful thing.

Pyro also recommends for EOTS that you use your maximum resilience/tank/survival and/or speed boosting spec. It is worth it to respec, for example, into frost as a mage and get improved blink for added speed and survivability. DK's should spec into blood and get all the self healing/survivability talents, and use unholy presence for runspeed increase. Druids should definitely grab a feral spec for survivability and cat runspeed increase along with dash, etc.

The entire hard knocks achievement frankly is a big middle finger from the developers to it's player base, and the EOTS one in particular is a straight kick in the balls to anyone seeking the achievement. I think the best thing that people can do is to try to queue up with friends and figure out a way to communicate with the other side, if they can, to help everyone get the achievement. If you don't have friends, I recommend you try to get in on a premade, if possible, because a premade is always going to be better than queuing solo into a pug.