Most colleges & universities in the U.S. ask for a homeschool transcript (typed up by Mom and teen) and SAT scores, maybe an essay. Here, unschooled/homeschooled teens can start taking college courses (for free) at the age of 14 (Florida), and many start at 15 or 16, taking one, then maybe they will take another, then maybe 2 or 3, then by the time they are done highschool homeschool, they already have college credits and are often easily grandfathered in, sometimes without having to apply at those colleges, then after a year or two of full time, they can transfer to bigger schools, if they do desire.
You can actually call any local colleges and ask what their policy is for homeschoolers. It also might be listed on their websites. Here, high school academic scholarships can be obtained by homeschoolers and so homeschoolers tend to base their transcripts on the requirements for the scholarships, because they tend to be more specific and have more requirements than the colleges do. So if your area has standard academic scholarships for high schoolers, you might want to see if they are available to homeschoolers, as well. Unschoolers are simply a type of homeschoolers, by the way, even for these purposes. Note that scholarships and college requirements for homeschoolers change often, sometimes every year, so if your children are young, you really don't need to look into it until around 8th or 9th grade, then each year thereafter, to make sure you don't miss something important.