Workflow TimeStamp

i think what you need, customize your Workflow and add a extra action on each step to write in history(may called log).check this one, good starter.

http://spandps.com/2012/02/14/writing-history-events-from-a-sharepoint-designer-workflow/

http://fabiangwilliams.wordpress.com/2013/04/24/finally-a-sharepoint-designer-that-developers-and-bas-will-love/

http://www.lynda.com/SharePoint-tutorials/Writing-workflow-log/105501/110627-4.html

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