We all knew that Plants Vs. Zombies was all set to hit the Xbox Live Arcade sometime in the near future, but what we didn’t know was that it will include never before seen multiplayer modes. At the current moment some version of Co-Op and Versus mode is confirmed, thanks to the above achievement screenshots.
I sincerely hope the versus modes are full on plants versus zombies, as opposed to just a simple mini-game. It could work with one player choosing specific zombies and lines to attack from, and tasking the other player with building plants to defend their house, then switching roles after a round.
Whether these modes are locally enabled, or only over Xbox Live is yet to be seen!