Savior

Savior is a hidden achievement/trophy in Metro Last Light and Metro Last Light Redux that can be obtained in the level Contagion.

Overview
This achievement is awarded to the player for taking off their gasmask when Lesnitsky demands it. This achievement is earned near the end of the level Contagion and can be missed by shooting Lesnitsky instead (which also gives a negative Moral Point).

Trivia

 * This action is also awarded with a positive point for choosing not to risk Anna's life by shooting at them.