steam_achievement_progress table reference - Stingray Lua API Reference
A table that provides information about the progress of an asynchronous operation carried out by the Steam stingray.Achievement interface.
An instance of this table is returned by each call to stingray.Achievement.progress().
For example:
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Returns true if the operation has been finished, or false if it is still in progress.
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A string that describes any error encountered during the process, or nil if no error occurred.
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