Metro Last Light

You will unlock this aptly titled achievement through regular story progression near the end of the chapter "Depot".

No further description necessary to avoid spoilers.

Needless to say, this achievement cannot be missed.

While this achievement is unmissable and unlocks at the end of the level, you'll want to make sure to grab the collectibles and a few missable Moral Points while going through the mission.

Check out the video below for a full playthrough of the game showing all collectibles, miscellaneous achievements like this one, and the Moral Points I obtained (I skipped a lot of them) in order to get the Redemption achievement. The Depot mission starts at timestamp 1:43:15.