Talk:Achievements/@comment-220.245.20.189-20130825090704/@comment-4632427-20130825124947

As far as I know, it should be possible to get those achievements by having a friend attack your base (using a Raid or Occupy mission) and retreat repeatedly. As long as nobody else attacks without retreating to break the streak of "successful" defenses, you should get them.

That's how I got them, anyway. It's possible they've changed the way it's figured, but I double-checked it not that long ago.