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

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

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Gamification

Competitions and gamification
Gamification: Streak, Lives and Gems
Upgrade subscription
Card Gamification: Category Cards