May my Hand Forget its Skill
After completing the scouting missions for Daniel, you are given a chance to side with either Joshua Graham or Daniel. Siding with Joshua Graham and completing the subsequent quest will grant the O Daughter of Babylon achievement instead, siding with Daniel and completing his quests will grant this achievement.
Behind the scenesEdit
The achievement/trophy references Psalm 137:5 of the Bible. According to some translations, it is, "If I forget you, O Jerusalem, may my right hand forget its skill."