If achievement is at 100% then all you have to do is wait for it.
English
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It's at 100%. So I'm just stuck in limbo till this thing pops?
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Yup. This from support page. [quote]In some instances, you may meet the requirements to unlock an achievement but not immediately receive a notice or update to your gamerscore. The Xbox Live service validates the unlocking of achievements and, though rare, delays can occur. Don’t worry – your progress has been recorded and the achievement will be awarded shortly, usually in less than 24 hours.[/quote]
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Ok. Thanks.