I can't find "AUdit Action Type" in an audit. I see an action and a class. Here's a query I'd potentially use:
SELECT *
FROM sys.fn_get_audit_file([Path],
DEFAULT, DEFAULT) AS fgaf
JOIN sys.dm_audit_actions AS daa ON daa.action_id = fgaf.action_id
JOIN sys.dm_audit_class_type_map AS dactm ON dactm.class_type = fgaf.class_type
JOIN sys.dm_audit_actions AS daa2 ON dactm.class_type_desc = daa2.class_desc