X Marks the Spot

Hopefully I can answer some people's questions regarding this intimidating achievement chain...

The best place to farm scrolls is in the depths of Froststone Vault. And whilst farming these you're going to want to grab yourself several [item=204560] from [npc=200563] for 2000 [currency=2118].

One thing to note about the [item=204560], which I realized after, is that as soon as you loot ANYTHING the buff is consumed and gone. So what you need to do is farm/ kill as many as you can in around about 10 minutes and then mass loot (At least that is what I did).
I got 68 scrolls with the use of 13 [item=204560] which was a period of 2 hr 10 min. And 68 is just too many... I messed up.
You only need in total 50 for both X Marks the Spot and Scroll Hunter!
You can sometimes find a group of people to get these down faster on group finder, or list one up of course.

/way #2151 34.00 59.81 Kraxxus
/way #2151 60.66 37.36 Froststone Vault Entrance

The following scrolls will aid you to your achievements:

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• [item=202669]
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• [item=202667]
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• [item=202670]
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• [item=202668]
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Now once you have these scrolls, you can click the same scroll around about ~5 times and 5 red 'X' will appear on your map, then game will then not let you click another to prevent you from wasting them!
A nice quick way of using the scroll will be able to max out a certain scroll, then stay at one point, loot, click the same scroll again and the easy cycle will continue.

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• A different way to put the above, say you have 20 [item=202669], you click it 5 times, the game will not let you have more than 5 active X on your map. Go to one of the X, loot the fish, and click another [item=202669], the fish will be at you feet every time :)
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The action of looting the item from the X contributes towards the achievement, you don't exactly need to hand them in, but you can of course!

[item=202854] goes to [npc=200562]
[item=202872] goes to [npc=200564]
[item=202871] goes to [npc=200566]
[item=202870] goes to [npc=200563]

/way #2151 34.21 60.03 Turik
/way #2151 34.07 59.96 Storykeeper Ashekh
/way #2151 34.32 59.98 Cataloger Daela
/way #2151 34.00 59.81 Kraxxus

You can use [item=204560] from [npc=200563] in town to make these scrolls drop more often, but beware, this items buff is consumed on loot. So you will need to buy more to maintain your buff for every scroll looted.

I started off farming this achievement by looting treasures to wok on Hoarder of the Forbidden Reach at the same time. After getting this achievement, I felt looting the treasures was not efficient, so I started farming mobs with the above buff at /way 57.77, 66.69
These mobs respawn instantly after you start killing them. They also drop the JC boss summoning item [item=203404] which is used to craft Crystal Tuning Fork - which sells for quite a bit. I was averaging a scroll every 5 minutes or less. I finished the 50 looted in a few hours.

Edit: They have fixed the really quick respawning but you can rotate the south courtyard and the top part for efficient kills.

The scrolls do not show up in the mail. Don't follow that advice.