Good Morning Jane,
In our school, we acknowledge the completion of Honors-level assignments by using Outcomes. This allows us to essentially use a Pass/Fail scale (we call it Honors Complete/Incomplete) which does not add any points to the course grade, as a regular Scale would do.
As an admin, you need to add a site-wide Outcome (Site Admin - Grades - Outcomes)
Teachers then go to the course settings and enable outcomes, and then add the outcome to each assignment (while setting the assignment grade to No Grade). We ended up creating our own category to place our Honors assignments in so they are grouped together in the gradebook. I've attached directions that I gave to my staff to add the outcomes to their classes (Hopefully this will be helpful to you.). When teachers grade these assignments, there is no option to give a grade, but in the last column on the grading page, there is the option to select the pass/fail from the outcome drop down.
Here is an image of what this would look like to a student (notice the category total has no grade)
Note, we haven't tried this with Quizzes, only Assignments. Also, another option that was recommended to me before I decided to use Outcomes was to use a pass/fail scale (which does assign a grade) but then have that category drop the lowest grade.