I believe that only Shivering Isles has any extra achievements, but if you can pick up the disc that has that and Knights of the Nine on you'll be set. The Shivering Isles is a true expansion pack and has many many hours of game time,and has quite a crazy
story to boot!
Just seen that it's 2400 :O[/quote]Lol, thats why I said look for the disc! £20:40 is a tad on the rough side for DLC that is 4 years old! If you can rent it or borrow a GOTY version,the DLC can be installed then the disc returned!
Was only 1200msp a couple weeks back......i paid the 2400msp though a year or so back, worth every msp imo, loads to do and a huge area to explore, if you loved Oblivion it's a must getting the DLC shivering isles, dont bother with the other DLC though.