Is there a complete list of all hidden keyboard shortcuts in OSX? I keep discovering keyboard shortcuts that are not listed anywhere under preferences. For example, I discovered here that ⌥ ALT⌘ CmdE will eject all partitions on a disk when a partition is selected. How the heck do people find these shortcuts, and where can I find more?
Not sure if this is a complete list, but this is a pretty good start from Apple:

https://support.apple.com/en-us/HT201236

Here is another link to an image of the shortcuts:

http://dashkards.com/img/dashkard-macosx-general.png