Why do you need to know all of them? In my niche focussing on web based stuff I need a fairly broad set of skills but nowhere near that broad.
I only tick a few of them but the skills I use every day go from DRBD, OCFS2, MySQL low level stuff all the way through to Wordpress and jQuery.
Each one I need to know quite thoroughly and I make a point of staying current with all of them plus keeping an eye out for anything new that could help.
And good luck knowing Android 4.1 for 5 years.