It's not about feats, Nth metal has certain inherent properties which include NPI, energy manipulation/absorption, minor physics manip, vibration manipulation when clashing with other Nth metal and a few others. Anyone holding it would have access to all of that by virtue of them being inherent to Nth Metal, it's like gold being a great conductor of electricity or asbestos releasing fibers that can cause lung conditions.
There are other abilities it gives, such as enhanced physicals and regeneration, which are shown by the Hawk-people but Batman would not have access to, however, since they come from being exposed to it a lot more than he has been and are contrasted by his showings.