This level is 3 of 5 of the Justice League Story Missions, and this is a unmissable achievement as it’s for natural story progression.
Level 18 - “These Boots Are Made For Stompa”
*** Spoiler - click to reveal ***Once again this is a short level compared to the main story levels and has no major confusing puzzles to tackle, you have to kill 3 bosses in total.
The first one is a 6 heart Boss called Lashina which is very easy just mash 
.
Then you have to destroy Mad Harriet, who is a 4 heart Boss and also is just a mash once again.
Finally onto Stompa to destroy which you need to build a Boulder from Mad Harriet’s throne with the Green Lantern, so defeat her too then end the level.
As soon as the cinematics cut in pop achievement unlocked.
Congratulations
Happy Hunting