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

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

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Gamification

Gamification: Streak, Lives and Gems
Daily check ins
Gamification badges
Gamification with the translation camera