Sort of like a life list
Only way to do this properly would be to spend hours going down a list of every movie made and check them off as you went down.
If you're a birder, you know what a "life list" is... If not, it's simply the list of all the bird species you've seen in your life. Most bird books (such as, the NatGeo one I have) print check boxes in their indexes for the purpose.
The concept is applicable to other collectors "by vision", and I guess the list could be extracted (say, by year) from IMDb.
There are a lot fewer birds.