Achievements are a way for you to keep track of important tasks you can perform, as an Artist, to continue building your journey in Sessions. It's a good way for you to see what you can do to improve as an Artist and as a streamer, and completing these Achievements earns you extra Prize Pool Points.
You can find this list of tasks inside your Artist Hub - just visit the "Achievements" page inside the "Love" menu. See also: Help Article: "How can I access the Artist Hub?".
Check out the following Sessions Webinar Series video about this subject!