Every site has a legend on its badges page. Assuming people read from top to bottom, the unformatted text is:
"Gold Badges are rare. You’ll have to actively work toward these. They’re something of an accomplishment! Silver badges are awarded for longer term goals. ..."
It kinda looks like silver badges are harder to get than gold ones.
Things are slightly better for tag badges, but even the tag badge legend is redundant once any user earns any gold tag badge.
The gold/silver/bronze medal system is already well-known across the globe. Let's just remove the legends; they're pointless at best and confusing at worst.