Slayer of the Undead

is an achievement in.

Objectives
Kill skeletal creatures, the walking dead, restless spirits, and vampires.
 * Skeletons (1,000) - Othrenis is filled with Skeletons.
 * Zombies (1,000)
 * Ghosts and Spirits (1,000)
 * Vampires (500) - The Orchard is filled with Vampires.