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Chromatic Calibration: Cranial Cannons
Craft each of the following goggles listed below.
Chromatic Calibration: Cranial Cannons is a 5-point Legion Engineering achievement that rewards cosmetic goggle appearances for each color by crafting all twelve Legion Engineering goggles on a single Engineering character.
Obtain the Cranial Cannon Schematics
Pick up the 
Schematic: Double-Barreled Cranial Cannon, Schematic: Ironsight Cranial Cannon, Schematic: Sawed-Off Cranial Cannon, and Schematic: Semi-Automagic Cranial Cannon from the Engineering vendor in Dalaran.
Obtain the Skullblaster Schematics
Acquire the 
Schematic: Chain Skullblasters, Schematic: Heavy Skullblasters, Schematic: Rugged Skullblasters, and Schematic: Tailored Skullblasters — note that these schematics can be obtained on an alt and the achievement is account-wide, but the Skullblaster recipes are significantly harder to acquire and come from 
Sprocket Containers.
Craft All Twelve Goggles
Using your Engineering character, craft at least one of each goggle at Rank 1: 
Double-Barreled Cranial Cannon, Ironsight Cranial Cannon, Sawed-Off Cranial Cannon, Semi-Automagic Cranial Cannon, Chain Skullblasters, Heavy Skullblasters, Rugged Skullblasters, and Tailored Skullblasters — all armor type patterns were made available in the Dragonflight prepatch, so a single Engineering character can complete all crafts.
Tips
All crafted goggles are Bind on Equip, so any goggles you do not need can be listed on the Auction House after crafting them for the achievement.
You only need to craft Rank 1 of each goggle for achievement credit — higher ranks are not required.