In 1995, Haemophilus influenzae was the first organism to have its genome completely sequenced. Since then hundreds of creatures have been added to the list, including humans. Here's that first complete genome, a beautiful merger of art and science.
"Whole-genome random sequencing and assembly of Haemophilus influenzae Rd." Science: 1995 Jul 28;269(5223):496-512.
By the way, Haemophilus influenzae is a bacteria, not one of the viruses that causes the flu (it was falsely accused of that crime at the time it was discovered and named, back in 1892).
Hat tip: The Loom