Where can I find an at least Semi-Comprehensive list of what biochemical reactions Acetyl-CoA participates in?
I may be missing some fantastic resource, but my first thought is to send you to KEGG.  Is that crazy?  Maybe, but a simple search for Acetyl-CoA in humans can give you tons of useful information, including GO terms, enzymes, genes, and, yes, biochemical reactions; just use the KEGG Pathways tool and specify humans (hsa).  You can click on each individual pathway for more information, such as the cholinergic synapse.