Well, Pilgrim's Bounty is now upon us, a new title and pet available from it (though you don't need it for the World Event achievement, it's always fun to get a new title, now that I've recently started getting them.
I'm not going to delve into the specifics of the achievements much, since Darth already has an excellent write-up on them, which adds to the guides already out there.
Instead, I'll add my viewpoints from the altoholic standpoint. Before, when world events came along, I'd do some of them, then give up, because I knew I couldn't finish all of the achievements needed for the title. I figured I'd get back to them later, when I finally hit 80 with one or some of my toons. However, I had been ignoring something very, very nice that happens during these times.
Normally only available to level 70's and above (unless you're a cook, which allows you to do the Dalaran cooking daily at 65), World Event Daily Quests are usually easy to complete quests that offer a decent amount of gold, sometimes rep, and most importantly, usually a bubbles worth of experience for a few minutes work. With the Midsummer fire festival, I'd log in to do Torch Tossing and Torch Catching, and gain an easy 2 bubbles of experience a day for each of my alts. That's huge for me, since months or even years can go by for a toon before they get out of a city. Banesidhe (my first mage) stayed at level 40 for at least a year, before getting up to level 46 recently with the Hallows End and I believe the Midsummer Fire Festival earlier this year. If I can get to level 48, I'll be ready to zerg out to level 50 with grinding Timbermaw rep, same as I did with Clockwrkmage on my Ally server.
So, my tips on getting some easy gold and xp for your alts, without pulling out your hair in frustration over the lore cooking quests that you think you might have to do. Don't worry about the quests that aren't Dailies, do them as you come to them, but the reward? you get from doing the "Lore" related quests isn't something you will want to rush towards.
Stock up! Clear out as much of your bags as you can, and stock up to 80-100-120 of each area specific item (Cranberries, Sweet Potatoes...). You never know when someone will offer gold for you to cook food that costs copper to buy. Plus, it really, really, really sucks to run out of Cranberries when you're in UC, and you only have to cook 5 more to turn in a quest. Trust me.
If you can stand it, try to get as many Wild Turkey stocked up as you can. It's not a problem to replenish your stocks of pumpkins, but it's annoying to have to go out of the city to kill another 20 turkeys each day. Just try to get 60+ the first time, while you're going for the Turkinator achievement, and see if you need more after that.
Try to do all 5 dailies with all your alts. It only takes a few minutes to run from a portal to where the dailies are, cook up the mats, and turn them in. Then hearth back to Dalaran, portal to the next city, turn in or pick up a daily there, and log out. Rinse and repeat with the next toon. By the time you've done this with your 10th alt, your first one will definitely have their hearth up, and will be ready to go to the next city.
If you're going to visit the enemy capitals, you might as well explore the zone around there, since I doubt you'll want to come back again when doing all your exploration for the Explorer title. Darnassus and the Exodar are annoying zones to get to as a Horde, so you might as well kill 2 achievements with one trip.