As with the other horde achievements, you don't need to do this in one go, ie. you can some waves on one session, and the other waves on another session, or however you want. However, tracking which waves you've done can be a pain (the in-game tracking system tells you how many you've done, but not which ones), so I made a printable checklist for all the achievements in pdf format.
Enjoy:
http://www.mediafire.com/?u8nz9f8ia7ujbd1