Sprinting in the Ravine

Seeing as this achievement is now tied to a fairly unique piece of decor and i'm an infrequent pvper, I think its worthwhile to share my opinionated experience grinding this out over the course of 5 days. Actually it took less time as I also queued comp stomp for other goals. The grind seems more intimidating than it is and I completed it in 42 Deephaul Ravine specific BG queues. Try to aim for 1 capture per match, but don't lose sleep if you miss it, you can make it up.

How Deephaul Ravine Works
Worth googling for images of the specific locations, but a short explanation is that first to 1500 score wins. You gain score by controlling mine carts on the way to and until their destination as well as by bringing the crystal in the middle to the capture location on either side.

How the Achievement Works:
Picking up the crystal and turning it in at either location will give you a single capture credit. You can pick it up either from the central location where it spawns or from a player who died while carrying it. You don't get credit for allies turning it in nearby or anything like that. If you don't see this achievement and your progress, look for the previous achievements in the series. Its located under PVP -> Deephaul Ravine.

Tips:

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  Play the BG to win. Winning is speed. If you're selfish and spam click the crystal instead if fighting, if you quit, talk !@#$ and make others quit, or whatever, you're less likely to get help and way more likely to lose. When you are winning, you can freely run the crystal. If you get off to a good start, you can get 3+ caps in a match rather than struggling for 1. Its just more efficient.
  
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  Do not play a healer or a tank. This goes along with playing to win even though it may sound contradictory. While a healer and tank are undeniably better for surviving the crystal run, you are hurting your team by not being in the fight. If you lose the match and get graveyard farmed, you get no captures. Its in your own interest to win. Its very rare a full on crystal brawl takes place while trying to cap (lots of fighting before that however!) and even if one does break out, you don't want to be slowed as one of these roles while carrying the crystal.
  
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  Play a geared character. You don't need to be bis or even in pvp gear, but if you are undergeared, you make everything harder. If you're drastically undergeared, its impossible. Carrying the crystal puts a target on your back, literally. That being said, buy a set of pvp trinkets. This is basically non-negotiatble. You want the on demand CC break one and one other of your choice for the set. You gain a lot of health and the CC break is necessary both to win and to help secure caps. It costs around 1k honor for 2 trinkets and is probably worth queuing random BGs until you have that before even attempting this. Save yourself the headache.
  
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  All classes are capable of running the crystal. However, Druid, Warrior, DH, and Shaman stand out as great options. A common way to lose a cap is to get knocked down the cliff and all of these classes can counter knockbacks. In addition, they all have increased mobility. This isn't to say other classes are bad, just that they have different niches. Shout out to Warlock and Monk for supposedly being able to place their Circle/Transcendence on the mine cart track above the crystal, however you are very vulnerable to knockbacks up there.
  
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  If you are losing, try to make the most of it. Ride the mine cart and try to intercept an opponent crystal carrier. This isn't super reliable solo, but becomes insanely reliable with a buddy or two. Keep in mind if you are losing your team the game because 3/10 people are crystal hunting, you're kneecapping your chances. Play it smart, winning is the priority. Remember once you steal the crystal you can turn it in at their spot. Quick and easy.
  
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Finaliy, some notes for the current time (end of The War Within). Honor typically resets at the start of a new expansion, not season. So if you wish to farm honor for multiple copies of this decor at the same time, you may get kneecapped by the honor reset depending on when the reset happens. Im unsure if the honor reset means prepatch or actual expansion release. With just over 1 week until the prepatch you should be honest with yourself and wait if you aren't confident you can get it done in time. Otherwise, wait until after prepatch or until full release if you plan to farm it really casually.

its a progression ... 1) Wandering in the Ravine (1 Crystal) , then 2) Running in the Ravine (10 Crystals), then 3) Sprinting in the Ravine(50 Crystals)

This is the single worst decor requirement in the entire game to unlock. Teammate captures don't count. 10+ minute wait time just to have a 50/50 chance of getting steamrolled and making no progress on the achievement at all