For the sake of trying, let us assume we had those "one shot"-achievements. Could you even nearly think of the impact on the GM´s that would have? People crying to get rolled back to the day before where they didnt die and where they had no disconnect, ... .
Just thinking of the one who open such tickets legit and well there will be other as well and we know it.
How i see it blizzard has gone the other way round last years, probably due to exactly this reason.