Ecael wrote...
If you do 1 - 3 assignments after the Collector's attack, about half of the crew including Kelly and Gabby will die. However, Doctor Chakwas, Ken and some unnamed crewmen will survive. You can still do Legion' Loyalty mission so long as you do not land on any planets or stations (ie... any assignment, The Citadel, Omega, etc.), as the game registers these as time, and the entire crew can still survive.
I've never tried this, actually...
I know any mission will count, but I'm not sure landing on the Citadel or Omega actually counts, unless you're doing a loyalty mission there. When I was keeping track of when new dialogue pops up for the crew (which happens after missions), my trip to the Citadel (where all I did was meet with Anderson and pick up Kasumi) didn't count as a mission to progress the dialogue further.
I also just wrote down who "half the crew" were that died. Kelly, Gardner, Gabby (Ken seems so lost without her. :/), Rolston (he's the one who talks about his daughter), Hawthorne (crewman speaking in the mess hall who also tried to help Joker), Goldstein (other crewman in mess hall), Hadley (crewman in CIC) and Matthews (other crewman in CIC) all died. Some of the background characters who stand silently in the background also appear to be missing, but I didn't keep track of them.