Closet Full of Skeletons

To get this achievement you need to craft 16 Nights of Dead items.

they are:

Shackled Human Skeleton - Forge Sinister Chandelier - Forge Baneful Bone Mound - Work Bench Petrified Bone Tile - Work Bench Crawling Captive - Work Bench Fearsome Skull Garland - Work Bench Menacing Bone Fetish - Forge Frightening Bone Fetish - Forge Sinister Candelabra - Forge Baneful Skull on a String - Forge Swinging Bone Collection - Forge Creepy Skull Garland - Work Bench Gruesome Bone Fetish - Forge Threatening Skeleton Display - Forge Noxious Skeletons - Work Bench Baneful Bone Arrangement - Work Bench

You get the achievement after crafting all 16 items. Items are made at the forge and at the work bench.