In the system folder in your explorer (in studio pro) you can find the folder called account. You can make a listview of those accounts. With %CurrentUser you can withdraw the user that is currently logged in and match it with the list you retrieve.
HI Priyanka Sawant,
I would suggest to create a non persistable entity A which has columns same as you have in your grid. Ex EName,Progresscount, Completed Count.
In a page add a Datagrid with data source as Microflow . In the microflow Create a empty list of Object A and retrieve account and loop it to retrieve the individual activites. Now you can add list operations to calculate activities with different status. Then create a Object of A and set the necessary values and add it to the list and at last return the list .
I hope this works!!