There are some out there already, but I reckon we can do better.
Below the cut is my rough draft. What do you think? I'm open to suggestions!
THE A-Z OF WRITING
A is for Audacity and Ambition (doesn't hurt to have a little of both)
B is for Books (so obvious it's blinding)
C is for Crisis, Choice and Consequence (thanks, tallaudrey!)
D is for Dreams (where I get my best ideas)
E is for Effective and Entertaining (stories that are both get away with anything); also for Editing
F is for FINISH
G is for GRAMMAR; also for Goals
H is for HARD WORK (and Haiku!)
I is for Ideas
J is for Just Do It
K is for Kudos (not what we do it for, but hell, it doesn't hurt either)
L is for Listen and Learn
M is for Market
N is for Novelty (not always the same thing as Originality)
O is for Originality (not always the same thing as Novelty)
P is for Professional; also for Punctuation ETA and Proofread
Q is for Quality (settling for "good enough" is never good enough)
R is for READ ETA and also for Revise, then Resubmit, Resubmit, Resubmit, etc) (thanks, punktortoise!)
S is for START ETA and Story and knowing when to Stop (thanks, battblush!)
T is for Talent, Technique and Tenacity (thanks, Kate!); also for the 10.5 Commandments
U is for Ubiquitous (people who say they want to write but never do), Unexceptional (most people's first efforts, including mine) and Utterly Usual (receiving rejections, lots of them); also Utopian (a world in which none of these three things are true)
V is for Verisimilitude
W is for WRITE
X is for Xenophon (not the senator; the writer who once said "The sweetest sound of all is praise") (thanks again, tallaudrey!)
Y is that proverbial crooked letter (if you have to ask why you're writing, maybe you shouldn't be writing at all)
Z is for Zeal ("fervour or tireless devotion...and determination in its furtherance; diligent enthusiasm; powerful interest "--you get the picture) and for the Zeroth Commandment (commitment)
Is there anything major I've missed?
ETA See the comments for some excellent suggestions that haven't quite made the list!