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.