Invisible Soldier achievement in Metro Redux

How to unlock the Invisible Soldier achievement in Metro Redux: Complete the REVOLUTION level without killing and raising an alarm

Metro Last Light Redux - Invisible Soldier Achievement/Trophy Guide - Revolution, No Kills/Alarms

Metro: Last Light Redux Achievement Guide & Road Map

Invisible Savior, Metro Wiki

Metro Redux Achievements - View all 98 Achievements

Metro Last Light Redux - Invisible Soldier Achievement/Trophy Guide - Revolution, No Kills/Alarms

Metro: Last Light Redux Achievements for Steam

Metro: Last Light Redux Achievement Guide & Road Map

Guide for Metro Redux - Metro Last Light levels 6 - 10

How to Get the Generous achievement in Metro 2033 « Xbox 360 :: WonderHowTo

Achievements and Trophies - Metro: Last Light Guide - IGN