Here is the full list of all 11 Neighbours back From Hell achievements worth 1,000 gamerscore.
Finish the pilot episode
Unlock the second season
Finish all episodes from the first season
Unlock the third season
Finish all episodes from the second season
Unlock the fourth season
Finish all episodes from the third season
Unlock the final episode
Finish all episodes from the fourth season
Finish the final episode
Finish all episodes