@tiffseg Because these are two separate objects, you will have to create 2 different reports - one for Task Approvals and one for Document Approvals. To view past task approvals, create a task report and add the following text mode filter:
EXISTS:1:$$OBJCODE=ARVSTS
EXISTS:1:approvedByID=$$USER.ID
EXISTS:1:status=AD
EXISTS:1:taskID=FIELD:ID
To view past Document Approvals, create a Document Approval report and add the filter for Approver ID > Equal > $$USER.ID
If you have any questions, let me know!