I think I must be missing something, but is there a keyboard shortcut for image/ adjustment/ brightness/contrast?
No. And in general, you should not use Brightness/Contrast. It’s good for newbies just learning Photoshop, but once you’ve progressed, you won’t use it any more.
Brightness/Contrast is a "linear" command. When you use it, it degrades the quality of your image by removing ("clippng") hilight and/or shadow detail.
Instead, learn to use the Curves command (Command/Control-M). Absolutely, positively everything that Brightness/Contrast can do, Curves can do too–but Curves also lets you do a whole lot more (like increasing or decreasing contrast in only one tonal range, changing color, and so on). And Curves is a "nonlinear" command, meaning it does not degrade your picture by clipping detail.
Once you learn to use Curves, you’ll probably never use Brightness/Contrast again.
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