Cataclysmically Epic

Easiest method is to join a 2s team, and just win 5 matches a week for 3 weeks. This should net you enough points to buy items, equipt them, and sell them back. For trinkets/rings, as they've always been. You can equipt them in one slot, then switch the slots.

Additional Info:
For the alliance: Inside the Champions Hall (last right before SI:7) go to the NPC that's the left right by the steps named Captain Dirgehammer.
For the horde: Inside the Hall of Legends, the NPC on the right is named Sergeant Thunderhorn.

Pricing Breakdown:

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• Chests, Helms, and Pants for 2,200 conquest points
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• Belts, Shoulders, Gloves, Trinkets, and Feet for 1,650 conquest points
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• Cloaks, Necks, Bracers, and Rings for 1,250 conquest points
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• Relics, Wands, and Thrown for 700 conquest points
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• Shields are for 950 conquest points
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• Weapons are anywhere from 3,400 (two handers) to 950 (offhands)
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Hope this helps!

Editing for additional info.

This can easily be obtained, by just "borrowing" loot from raids just to equip it, then trade it back. That's how I got mine.

I have this achievement, but somehow I don't have the "Epic" one.