Originally posted by batofgotham
Like Jerem92i said, you must play the level with the trophy that you don't have and it will pops.
Example :
For the trophy The Chill in the Air
Complete the Crime Alley AR Challenge unharmed as Batman, Robin and Nightwing.
I guess that you need to play just one more time with Batman, Robin and Nightwing before the trophy pops.
Or maybe juste one character is enough.
For that trophy you need to complete the level with only one caracter without taking any damage.