You can unlock avatar items by earning achievements through playing iCivics games while you are logged in. Each game has a set of achievements (they appear below the game window) and earning them unlocks upgrades and accessories for your avatar. Some unlocks are related to specific games, while others are just general.
Remember: you must be logged in when you play for achievements to be recorded and saved to your account. A pop-up message at the end of a game should tell you how many Impact Points you've earned, as well as, if you've received any achievements and unlocks. Good luck and happy gaming!
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