I'm less bothered by the date stamp on the achievements and more concerned about actually getting them. Some people who started on march 20 could have potentially rushed to get as many achievements done on day 1. But that being said, I'm not going out of my way to quickly get the achievements, I'm just playing at a normal pace. There may be a few that I got at an earlier point in my current playthrough than when I got them on my original, but I don't mind. I'm more like a child in the sense I just get this excitement upon collecting those stamps on that page. ^__^