Savior Trophy in A Plague Tale: Innocence
Save a soldier
How to unlock Savior~If missed, can be obtained via chapter select~
Chapter 5: The Ravens' Spoils
As you cross a battlefield swarming with rats, you'll make your way through a toppled siege tower. There will be an English soldier stuck in the back behind a metal grate (you can hear him on approach). Take the torch and move into the next section and put it into the holder. Do not! advance with the torch to far or you'll push the rats in his direction, killing him and voiding the trophy. You should have a clear shot at an extinguished torch to the right of the soldier. Equip some Ignifer ammunition and use your sling to light the torch for him. The man is saved, the trophy is yours.
Video Guide: LINK
Credit to NonstopTrophies