The House of Horror Add-on for Viscera Cleanup Detail has 10 achievements.
Collect the chainsaw, boomstick, cursed hand and the evil book and return them to your office
Collect the mask and machete and return them to your office
Collect the clawed glove and return it to your office
Collect the white mask and butcher knife and return them to your office
Collect the axe and return it to your office
Collect the ring and return it to your office
Clean the entire House of Horror level
Destroy 200 items in the woodchipper
Destroy the Bad Banger
Get consumed by an inter-dimensional crack in space-time