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

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Daily check ins
Gamification badges
Gamification: Streak, Lives and Gems
Competitions and gamification