Well, the simplest way using LINQ would be something like this:
list = list.OrderBy(x => x.AVC ? 0 : 1)
.ToList();
or
list = list.OrderByDescending(x => x.AVC)
.ToList();
I believe that the natural ordering of bool values is false < true, but the first form makes it clearer IMO, because everyone knows that 0 < 1.
Note that this won’t sort the original list itself – it will create a new list, and assign the reference back to the list variable. If you want to sort in place, you should use the List<T>.Sort method.