On average, it certainly is a 'doable' goal. Just remember that even if you do lose 52# this year that each week may look different. Some weeks may show less than a pound loss, others may show more than a pound.
But there are other goals you can have as well, besides the amount you lose. (A result that we can work towards, but our bodies may have different ideas about.) Such as setting a goal to work out 30 minutes 3 times a week. Or eating all your fruits & veggies.
~Made of star stuff~