Sand, Sand Everywhere!

All of the sand piles for this achievement are within the Dormant Alcove, one of the Locus Shift treasure rooms.

It requires 7 [item=189863] to loot all 7 sand piles, which are obtainable from a variety of treasures:
/way #1970 58.74 73.03 [object=369757]
/way #1970 51.89 62.81 [object=374976]
/way #1970 60.02 17.99 [object=375354]
/way #1970 51.56 9.88 [object=375376]
/way #1970 49.76 87.23 [object=375405]
/way #1970 34.04 67.65 [object=375483]
/way #1970 49.66 77.85 [object=375495]

To access this room, you first must:

1. 
   
2. Research [order-advancement=1901] and [order-advancement=1904]
3. 
   
4. Complete A Means to an End
5. 
   
6. Unlock the Dormant Alcove from the [object=375191] at /way #1970 51.0 32.5, between 2 pillars, on the side of one of the pillars (accessible from flying or via the Quintus Locus and dropping down)
7. 
   

Next gain at least 60 Cosmic Energy and enter Gravid Repose. Use the Locus Shift to take the Interior Locus to the Inner Chamber. You will now see a new Locus Shift (the Arcae Locus) upon the platform at the north-western side of the room, which you can use to travel to the Dormant Alcove.

Each sand pile contains a specific epic item level 246 piece of equipment and the same amount of resources as other unique treasures (exact items may differ depending on class/spec/role):

• 
  
• [object=375396]: [item=188045]
• 
  
• [object=375397]: [item=188055]
• 
  
• [object=375398]: [item=188044]
• 
  
• [object=375399]: [item=188053]
• 
  
• [object=375400]: [item=190389], [item=190597], [item=190582], [item=190602], [item=190390], or [item=190726] as appropriate for your class/role/spec
• 
  
• [object=375401]: [item=190374]
• 
  
• [object=375402]: [item=188106]
• 
  

These have a global cooldown, so may not be visible for you if someone else has looted them recently (try changing shard with LFG if you can't see some of them).

Warning!: there is a bug with having full bags, where it will use up your [item=189863], but the treasure will remain and use up another [item=189863] if you try to loot it again, causing you to forever be unable to unlock a treasure for each time this happens to you. Please report this in-game, as they should either despawn and the loot mailed to you, or not use up an additional irreplaceable [item=189863].
Update: They have now added a "resolution" for this, which will cost you 200 [currency=1979] each (enjoy your kick in the face):

Players can now purchase additional [item=189863]s from [npc=183962] if they have not already earned the "Sand, Sand Everywhere!" achievement.

Applicable to PTR characters only: If you unlocked the [object=370512] or completed A Means to an End before [spell=365988] was added, you will not have [quest=65457] flagged, which is required to see the additional Arrangements. You will need to create a brand new character instead and complete [storyline=1264] again.

Credit to Matjz for the discovery of the location and items, and Neryssa for discovering the Arrangement.

Other Locus Shift treasure rooms:

Arrangement

Treasures

[object=375188]

[object=375746] containing [item=189463]

[object=375189]

[npc=185261] for a weekly reward of:

• 
  
• [item=190336] and gold
• 
  
• [item=189865] and [item=189864]
• 
  
• [currency=1979]
• 
  
• [item=188957], and a chance for [item=189179]
• 
  
• Any combination of 2 from: [currency=1979], [item=188957], [item=189544], and gold
• 
  
• Random Cypher Equipment
• 
  

[object=375190]

[object=375494] containing [item=190096]
[object=375270] containing [item=189440]

[object=375192]

[object=375902] containing nothing special

To unlock Dormant Alcove, if you are having issues, click the Symbol at

/way 51,32 on top of a pillar outside.

I put in a ticket and everything as this information isn't listed anywhere. Or at least I couldn't find it. Hope this helps everyone!

Edit: You must be outside when entering these coordinates. Apologies for any confusion.

I don't like sand. It's course, rough and irritating, and it gets everywhere.