Funny you should mention Mass Effect, because I'm playing that for the first time as well. Evidently there's a romantic sub-plot, making it even more relevant to this story. Will I get an Xbox achievement and 25 gamer points if I get lucky?
I don't know. I played PC. Also, achievements in a game like ME are stupid and ruin immersion. Turn them off if you can (on PC version I don't recall them popping up in game anyway).
As for romantic subplots - they are very good and the game will totally hijack your emotions through them.