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Dangerous Devices IV
Craft 2000 times with the Engineering profession.
Dangerous Devices IV is an Engineering profession achievement added in patch 10.1.7 that requires you to craft a total of 2,000 items.
Stock Up on Stone
Purchase stone from the Auction House to use as crafting material — the cheapest current option is Porous Stone for crafting Porous Polishing Abrasive via Shadowlands Engineering, or alternatively 
Solid Stone (2 per craft for Solid Blasting Powder), 
Coarse Stone (1 per craft for Coarse Blasting Powder), or 
Dense Stone (2 per craft for Dense Blasting Powder). Be aware that stone prices on the Auction House can spike when crafting achievements are active due to high demand, and the Auction House may autobuy at unexpectedly high prices if you are not careful.
Craft 2,000 Items
Craft your chosen Blasting Powder or Porous Polishing Abrasive repeatedly until you reach 2,000 total crafts, which completes Dangerous Devices IV. If you can source Linen Cloth, Wool Cloth, or Silk Cloth cheaply, you can also convert Blasting Powders into their corresponding Dynamite variants to count toward the total.