I guess they realized how much they screwed up with these achievements, which means that hopefully the next DLC's achievements will be obtainable in private. Too bad I already got 9/10 of the achievements from boosting and lagged lobbies (did BOOSHKA! before it was even discovered to be obtainable in private).
Still though, good to know that it will be easier for everyone else who tries for them. It will definitely make it easier for me to get Surprise! now.