I am only 70% complete, but have finished all the side missions, what am I missing?

I have finished all secondary campaigns in Batman: Arkham City (including Riddler trophies/challenges) and have almost everything (level 41), but am only 70% complete. What major things could I be missing?

Solution 1:

To reach 100% completion you also have to complete New Game Plus, which is harder. The side missions are re-activated so you can redo them if you want. However, this is not necessary as missions in the first playthrough already count towards 100%.

Solution 2:

To get 100% completion of the game you first have to beat the game on normal or hard then complete the side missions that follow.The only missable side mission is watcher in the wings;here is azreals apearences After the court section of the game across the court house After the steel mill on top of the Ferris wheel After interrogating major sharp on a building After rescuing Vicki vale on a building Then you must get every riddle trophy and collectible to unlock all campaigns and maps look up on line where to find them all. Then get the exploration trophies,visit calendar man on different holidays,find crime alley and pay your respects to Bruce's parents,then glide off wonder tower and keep goings towards the city and turn around when your pulled back for about a minute for that trophy Then do the riddler challenges and campaigns.Note that you must earn 2 trophies also such as not taking damage and putting all of batman a moves into a combo Then beat new game +