Actually I just got this achievement today. And more specifically it doesn't have to be just in a single direction and you can stop or break in the middle if you don't leave the minecart, however tge point you reach by rail must be 1000 blocks away from your starting point along the x or z axis.
Joshua Pilachowski
Actually I just got this achievement today. And more specifically it doesn't have to be just in a single direction and you can stop or break in the middle if you don't leave the minecart, however tge point you reach by rail must be 1000 blocks away from your starting point along the x or z axis.