What might the analog be for Web literacy badges? How about achievements for things like…
*not closing an HTML tag?
*writing a CSS rule that never gets applied to a page because it’s overridden by other rules?
*falling for a harmless phishing scam?
*having your behavior tracked by the same company across 30 different websites?
*putting a security vulnerability in your code?
*making a web page that’s perfectly legible to blind people, but incoherent to those with vision?