Is it possible to display additional fields on the entries list in admin?
Yes, since Craft 2.3 you can edit the CP's index views for entries, assets, etc. from a plugin.

Have a look at the documentation for the hooks defineAdditionalEntryTableAttributes and getEntryTableAttributeHtml to see some sample code. Making a little plugin for this is easy, simply copy and paste the above sample code into your primary plugin class and then edit the parameters.