Ok, I'm pretty pissed now because me and 2 friends completed the campaign on legendary last night. After the last mombasa streets mission, You are suppose to get the good simaritan achievement. I did not have a single engineer kill, one of my friends had 9/10 and the other 4/10. As we finished mombasa streets, my friend with the 9/10 got the good simaritian achievement. I got nothing, and my friend with 4/10 got nothing. I am very frustrated as this will now require me to go through the whole campaign again if I feel like getting all the achievements now...Has this happened to anyone else? why would my friend who had killed them get the achievement but not me?