By modifying a view to show all the columns of Worfklow associated Status (many), I get this message:
"This view can not be displayed Because The number of lookup and workflow status columns it contains Exceeds the threshold (8) enforced by the administrator."
Do not worry, you can change this threshold, but it is not recommended for performance problems.
Read this post to learn more (in English):
The SharePoint 2010 "List View Lookup Threshold" and Why We Do not Change It