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I found this trick where you just win 6 private "Adam Grab" matches by yourself on each of the DLC maps. The next non-private match you win on a DLC map should give you both Territorial and Aqua Incognita.
I personally won the 6 private matches earlier tonight, and then finally played my first DLC map in a non-private match, but my team didn't win, and the Aqua Incognita achievment triggered. I'm assuming if and when I play on another DLC map and win, I'll get Territorial as well.
Since I posted this a couple days ago, I have not seen even one DLC map in a game lobby so I still haven't gotten Territorial yet. At this rate I'll hit level 50 before I get another legit chance at a DLC map.