How to get Task History in Nintex workflow 2010.
The correct way to review the history per workflow instance is described by burkslm.
You can also select the item the workflow executed on in the list, then click Workflows in the Ribbon or properties menu, then select the workflow name to view what Lisa described.
You can also skip direct to the list using a URL as Christophe Raucq describes, this way is not very readable but it's good to know it's there https://siteurl/Lists/Workflow%20History/AllItems.aspx
This is working in SP 2013 online but I believe you can apply the same idea.
Open your Workflow Task list.
In the url replace Workflow%20Task by the name of your Workflow History list
There is a workflow status field that you automatically get for a Nintex workflow. Include that in your SharePoint list view. Click on that link of the item you want to check the task history of. It will display task history as well as logs.
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