It's also useful for teaching new features. If you are mindful of the existence of achievements, you might check the list once in a while and see something like "Fast Copy - Use Ctrl-C to copy something instead of clicking on the button!"
The best thing about achievements are that they teach you new ways to play a game (IMO). When I play a game with well-designed achievements, I'm constantly learning: "Oh, I can approach enemies this way." Or they make me try a new weapon type: "Oh, this weapon is effective in this situation, now I will update my default play-style." I would love to have such achievements for Emacs, because I feel like I don't use it to its potential, but I also don't have a good sense of directions to explore.
I would recommend: When you want to customise the behaviour of some command, don't google for the answer. Instead do `C-h f` or `C-h k` to read the built-in documentation for that function or key. From the help screen, click the link to view the function's source code -- if you don't see that link install the "emacs-el" package (using your system's package manager). See what variables that function uses. Do `C-h v` to read the documentation for each variable.
