I was doing T3 rifts today in Amnytas, and had 80-something points in this step when I took a break. Went to a lounge, and noticed that the counter icon for that part of the achievement was no longer showing. Thought it was just because I was in an instanced lounge. Then I went to Skywatch to do some more rifts, and the icon was still missing. I just did 4 T1's in Skywatch and the icon appeared again, starting over. I stopped doing rifts when the counter was at 10. Then I went to Wizard's Tower and the progress reset all over again. I just lost all that progress, and this doesn't seem like intended behavior since there's nothing in the achievement text to imply that you need to stay on a single map and do all the points at once while still on that same map and IP.