Here is the full list of all 21 Witching Hour achievements.
Get the ‘Salvation’ ending in Witching Hour
Get the ‘Safe’ ending in Witching Hour
Find a component of the Trinity Spell
Get the ‘Hopeless’ ending in Witching Hour
Get the ‘Abandoned’ ending in Witching Hour
Get the ‘Taken’ ending in Witching Hour
Find the location "Lucilia’s House"
Find the location "The Woods"
Find the location "Greenwater Gardens"
Read from the Grimoire of Lucilia M.
Find the location "The Historical Society"
Find the location "Eastern Village"
Find the location "The Parish"
Find the location "The Pasture"
Find the location "The Weatherby House"