Spotlight is a lightweight addon for revealing your progress in unlocking the hidden artifact skins.
The addon is designed for optimal functionality using a LDB compatible display, but functions just fine standalone.
With LDB: Enable the plugin via your favorite LDB display (such as Bazooka, Titan Panel, or Chocolate Bar). Mouseover the LDB display for more detailed information. Clicking on the LDB display will toggle the default between showing progress as a percent or a fraction.
Without LDB: View your current Hidden Artifact Skin Progress via the command "/spotlight".