Hello Diptesh Kumar,
To get the work item history items like who changed it or who accessed the specific work item, you can use updates-List as it returns the work item revisions.
API:
GET https://dev.azure.com/{organization}/{project}/_apis/wit/workItems/{id}/updates?api-version=5.1
Also, you can use updates-Get to return a single update for a work item as given in the MS Doc.
GET https://dev.azure.com/{organization}/{project}/_apis/wit/workItems/{id}/updates/{updateNumber}?api-version=5.1
Hope this helps!
If the answer is helpful, please click on Accept Answer and upvote it. If you still have any further queries, please click on Comment.