This achievement is no longer glitched.
From the app's main screen, choose "SEARCH" from the top of the list on the left-hand side. Type in "activate the quasars" in the search field. The video "Inside Halo episode 21" should now appear twice; once under "Episodes" and once under "Videos." I don't know if it makes a difference which one you choose, but I chose the one under "Episodes." The achievement should pop a couple of seconds into the video.