An achievement represents an activity you have completed within the context of the University. This can be the completion of the course, or some housekeeping task or quest related to membership.
All of the courses, and many of the membership related activities and you 'University points', and these accumulate or directly earn you an achievement in the form of 'badges'.
Some achievements and you recognition from your peers as having completed certain levels of learning. This is the case for the 101 or fundamentals level learning. Some of those achievements are additionally recognized by the Credly system, enabling you to incorporate these badges in your career summaries and work resume.
A list of the achievement badges is available at the website here.