For certain activities, you unlock Achievement Badges. Some of these are Inner Circle, Sharpshooter, Big Spender, Overachiever, Overtime, Friendlt, Wildfire and Champion.

Each badge has 3 levels that you progressively unlock.

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Duolingo Clubs
Gamification: Streak, Lives and Gems
Change or add language
Learning experience
Asking for notiification permissions during onboarding
App Store screenshots
Top level tabs
Duolingo Plus
Gamification memes
App icon change
2019 redesign
Create profile

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Upgrade subscription
Converting steps to coins
Daily check ins