Deus Ex: Mankind Divided Trophy/Achievement Guide - God Killer
During the story (your second visit to Prague) you will get two quests that you must pick from. One of these quests is
M11: Confronting the Bomb-Maker, this is the one that you must pick. Make your way to Allison Stanick, the Women in charge of the church and the women behind the bomb attacks as of late.
When you reach her you get thrown into a debate with her and have 4 specific dialogue choices that you must pick if you wish to save her and everyone else (although you can really pick anything for this achievement).
You must pick;
Counsel > Focus > Focus > Counsel. After the Debate ends the achievement/trophy will unlock.