Here is the full list of all 11 Neighbours back From Hell achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Finished all episodes from the first season
Unlocked the second season
Finished the pilot episode
Unlocked the third season
Finished all episodes from the second season
Unlocked the fourth season
Finished all episodes from the third season
Unlocked the final episode
Finished all episodes from the fourth season
Finished the final episode
Finished all episodes