And once that's done, there's a supertank you need to fight. besides the military outposts that line the city with constant surveillance. After all that, you only need to sweep the City clear of mines, and you're done. And catch the eight or so other supervillains attacking Gotham, it only takes three or four so all-out brawls to catch one of them. Oh, and don't forget to collect the 200 Riddler trophies around.
It's not hard, just beat the Scarecrow by going through story missions. 100% Completion: It's how you get the Golden Ending.
