This official RuneScape update is copyrighted by Jagex. It was a direct quote from the RuneScape main page, but has since been removed. This update was added on 28 May 2001.
I have add a new button to the stats menu which shows you which of the 15 quests you have completed. I hope this proves useful to people who are trying to work out which ones they have missed, so they can complete them all!