Yes, there is a WordPress plugin for Credly.
BadgeOS is plugin to WordPress that allows your site’s users to complete tasks, demonstrate achievement, and earn badges. You define the Achievement types, organize your requirements any way you like, and choose from a range of options to determine whether each task or requirement has been achieved.
Badges created and earned in BadgeOS automatically go to Credly with out-of-the-box integration of the “Open Credit” API. Learn more about the integration at: