Forum:PS3 m1 ?

I Have Mass effect collection and m1 some missions i don't see in the assignments and main missions...Are they worded different, is it possible i died and lost them.Whats going on, trying to to get played most of the game trophy right off the bat so i don't have to worry about them later. Also wonder is the proethean codex only available at that one moment, because i cant get it to come back and Anderson has a new dialog and i cant find the other person it said to talk to on Normandy.