On the documentation the achievements method is documented as the following:
/json/friends/achievements/{game_id}/{gamertag}
However, this is incorrect as it pulls friends data for the user with the gamertag of โAchievements.โ The correct URL appears to be:
/json/achievements/{game_id}/{gamertag}
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This is now fixed, for the most up to date api documentation please visit the site docs here https://xboxapi.com/documentation