What all was invented in the high middle ages?

You can say Gutenberg was one.

There were plenty of inventions in the Middle Ages, but since there were no patents for inventors, and since people were not writing much about current events, there are few, if any, names recorded.

Among the medieval inventions are chimneys, which made it possible to have modern fireplaces; they were a 12th century invention, but we only know that they were invented in Northern Europe because that is where they first appeared. Most other inventions are similarly anonymous.

In the case of the artesian well, we know that it was invented by a monk or monks of an Carthusian abbey in Artois, France, in the year 1126, but we have no records of the names of people involved.

Even the invention of the printing press has elements of mystery surrounding it, and while every bright schoolchild knows the printing press was invented by Gutenberg, the deeper you get into the issue, the murkier it gets. I remember reading a book on the subject with a sense of frustration that there were no answers (wish I could remember the name so I could use it as a reference). The author said of Gutenberg, that we could safely say he invented something that had to do with printing, but we really cannot say for sure what that was. It could have been the press, but probably was not; it might have been the type, but very likely was not; it could even have been the ink. But the author thought the most likely thing to be Gutenberg's invention was the mold the type was made in.

The link below goes to an article mostly made up of a list of medieval inventions with some commentary. The list is long and includes some impressive inventions, but not much in the way of names. Jan van Eyck is credited with perfecting oil paint, and though oil paint had been introduced earlier, his formulation of oil paint probably constitutes an invention of a new type of oil paint. But most names associated with inventions are the names of the first people to record it or draw a picture of it, and during the Middle Ages they were more concerned with what it was than with who did the work.