I finished Arkham City's main story with the intention of wrapping up the side missions and trophies after as i had been told i could. However, immediately upon entering the city after beating the main story all of my side missions had dissapeared (with the exception of one or two). The one i mainly wanted to finish was identity theft mission but where there should be a victim at the end of a blood trail there isn't, thus preventing me from getting any further. Do the side missions go away after the main story is completed?