What is "achilleid"

The Achilleid is an unfinished epic poem by Publius Papinius Statius that was intended to present the life of Achilles from his youth through his death at Troy. Only about one and a half books (1,127 dactylic hexameters) were completed before the poet's death. What remains is an account of the hero's early life with Chiron the centaur, and an episode in which his mother Thetis disguised him as a girl on the island of Scyros before he joined the Greek expedition against Troy.