There are some truly mind blogging trophies. One of the trickiest ones for me was on in the industrial district. There are 4 pressure plates surrounded and separated by a chain link fence. If you look at your surroundings and realize the equipment you have and skills you have you'll figure it out. Actually putting those skills and gadgets to proper use is up to you.

Just one clue that may make some things easier for you. When in detective mode seek out the green highlighted guys and interrogate them. They will unlock the locations of the trophies and riddles. Also next time you are close to some water toss one of those freeze grenades in the water and see what happens.