badgeOS

from their site linked above:

BadgeOS™ is a powerful free plugin to WordPress that lets you easily create achievements and issue sharable badges as your users succeed. 

BadgeOS is brought to you by Credly, a universal way to recognize, store and share life’s achievements. People are learning, contributing, and proving themselves in more places and in more ways than ever before, and Credly extends credit-earning and issuing out of its traditional realms into any setting where skills, knowledge, or contributions can and should be acknowledged.

Through its release of BadgeOS, Credly empowers anyone using WordPress to use the platform as a community, engagement, and achievement recognition environment.