I am able to fetch the details of decision made in a certification campaign using v3 api but is there a possibility of downloading the status report in a pdf format which is same as what can be downloaded from the console?
There is no API that I am aware of that will download the certification report. This is strictly UI only at this time. However, I encourage you to submit an idea for this so our product team is aware of customers asking for this feature. https://ideas.sailpoint.com/