Being the Den Leader for the Bears, and having done the Wolves, I can say that the one thing that turns a mind into mush is figuring out the combination of Achievements, and the further combinations of requirements for each Achievement. Then, keeping it all straight for each Scout. Yuk.
A Google search revealed this site which has Achievement trackers for a variety of Scouting levels and activities. The trackers themselves are in both spreadsheet format and PDF. Even nicer, the author was aware of the existence of OpenOffice, so even though it was developed for Excel, it works with OO, or Libreoffice (the debian-ized version of OO).
Speaking for the Bear tracker, it’s quite a bit of work put into the sheet, but it’s well documented and pretty straight forward to use. I’ll be using this of my guys this year. If you’re a Den leader, these are definitely worth a look see.