So I've typed up in Excel all the Kindergarten benchmarks from the book by Rebecca Rupp called "Home Learning Year by Year". Benchmarks are things a typical kindergartener "needs to know." But you be the judge of that.
Obviously, some stuff like knowing the alphabet is important and leads to learning. There are other things on this list that you might just say, "sure, but we can hit that hard later on." And you would be fine. If you are teaching one child right now, it will be no problem to hit all these points. If you are like me and teaching 3 older kids and thinking about doing kindergarten with a 5.5-year-old soon while wrangling a younger one, you might choose to put some things off (like being able to describe the basic composition of the earth) while focusing on things like shapes and seasons and pre-reading.
Here's the link for kindergarten. I suggest buying the book so you can also benefit from all the wonderful resources the author provides, as well as a longer description of each benchmark.
Future grades can be found under the Blog Category of Benchmarks, as well as by grade.