Hi @saidivyareddy , welcome to the community.
First I would recommend using the search in the community here there are quite a number of discussions in around this topic. I would offer the following article as something to review and see if it meets your needs. Please understand I have not done this myself so cannot attest to its success rate.
how-to-export-attachments-from-jira-ondemand
there are also marketplace applications that you could trial. If you only needed to do it once then you could get by with a trial altogether.
Finally there is the rest API and I believe that you should be able to use it to iterate through the issues in a given project and pull the attachments.
Good luck!
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