Just about to play Civilization V so I don't think I will be playing anything else for a little while.  I have to say really enjoyed Halo Reach campaign but need to finish it on Legendary now but apparently my friends on Live won't let me! I also need to finish off Spider-man which is really enjoyable and very similar to Arkham Asylum without the polish. Dead Rising 2 is also apparently stuck in the post but with my backlog of games to complete I really don't mind too much. 
I was wondering which achievements should I finish off for S ranks: Call of Duty 4, Spiderman or Mass Effect 2.