I need help on dead rising?

i am trying to the last achievement(transmissionary) but i need help figuring out who i need to save to be in the rooms with the key survivors,like in order to get the calls for the key survivors there has to be more survivors in the room with them,i ade it 2 days and i only had one person in the room with flloyd and her name was sally...could some1 giv me a perfect list of what to do.....and who to save....