O Daughter of Babylon (challenge)

O Daughter of Babylon is a challenge $$ It is obtained after completing Gathering Storms and siding with Joshua Graham.

Requirements
The Courier must complete the quest Crush the White Legs.

Effects
Grants 100 XP and the O Daughter of Babylon achievement/trophy upon completion.

Behind the scenes
The name of the achievement/trophy references the first verse of Psalm 137:8 in the Bible.