#2 - Jan. 15, 2013, 10:59 a.m.
The initial version will only be for daily/monthly achievements (this will not be retroactively rewarded.) Later you’ll see a system in place that rewards more expanded achievements points which will retroactively reward all achievements already earned, yes.
However, there are some achievements which are infinitely repeatable currently. It is highly likely so this new system isn’t broken we’ll need to cap those and people who have made insane progress down one of those lines will lose some of their progress to get back to the cap. I wouldn’t recommend anyone go bonkers trying to progress an infinitely repeatable achievement category in anticipation of the release of this system, as you will likely lose some points/progress if you take it to an extreme number.
We’re still working out the details on the system, so that’s about as far into detail as I can go currently.