Is there a way to stop that message from shouting your updates have been completed or whatever it is? I love avast, but that part is annoying. Thanks.
You should be able to turn it off from the status page under settings/sounds. I turned them all off and that worked fine. 
Maybe this will help.
Click picture to enlarge
Thank you everybody. I will do what you suggested. You just earned avast some money, because I was not going to purchase it if I had to hear that noise. Thank you again.
Your welcome. Welcome to avast and the forum.