Here, done all 13 maps atleast 3 times , some of them even more, while taking part in the closing-portal events and staying until the end (getting end reward), didn’t ever swap characters or disconnect within the duration of an invasion.
Yet, I have been stuck at 12/13 invasions since the early stages of the patch, and still there.
I know many people who also got affected by the “12/13 syndrome” after all their work, which made them less couraged to keep attempting at big time consuming achievements like this.
I suggest for us players to get some kind of compensation regarding the matter, perhaps making the achievement cut at 12/12 as users in this thread pointed out.
Also, with the new Super Adventure Box patch out, we’re still getting invasions at a slower pace, but is Invasion Canceller still obtainable?