The Achievements plugin gamifies your note-taking experience in Obsidian by rewarding you with achievements for various actions. Users can unlock milestones such as creating notes, adding tags, making internal links, and organizing content with headings. The plugin offers progressive goals, ranging from basic achievements like creating your first note to advanced ones like establishing thousands of links or creating nested headings. It also includes achievements for using core Obsidian features such as the command palette and quick switcher.