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

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Gamification with the translation camera
Blitz Buy gamification
Gamification: Streak, Lives and Gems
Daily check ins