[問題] Xbox 成就點數(G)的用途是...?
機型：Nokia Lumia 620
系統版本（設定->關於->更多資訊->作業系統版本）：Latest version
韌體版本（設定->關於->更多資訊->韌體修訂編號）：Latest version
問題詳述：
請問一下，XBox 的成就點數能幹嘛?? 可以拿來買商城的東西嗎? 還是只是單純看爽的?
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