LEVELS: These are for going up a level on the site for doing various actions for which Hitlab gives its users points. These are simply numbered. Level 1, Level 2, Level 3, Level 4, and Level 5.
ACHIEVEMENTS: These are for specific tasks. One for commenting on songs, liking or reacting to songs, sharing songs, listening to songs, and drawing new users to Hitlab from sharing. These badges are named, respectively, as Critic, Aficionado, Promoter, Audiophile, and Tastemaker.