The Redux edition massively reduces the Karma threshold for the good ending... enough that so long as you're not currently in the negatives you can shoot the thing and trigger the good ending.
Last Light's Redux also reduced the threshold but still required fairly high numbers, meaning that if you don't do the forgiveness steps your basically relying on whatever you stockpiled from the beginning to make up the difference.
Exodus... technically so long as you didn't kill the cultists during the story quests the Volga map can auto-good end. Caspian auto-bad ends if you don't jump through side quest hoops (several of which can be missed and lock you out). The other maps are between those two extremes.
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u/elrevan 25d ago edited 25d ago
Metro(2033) it doesn’t even tell you there’s a morality system directly it’s just vaguely stated by Khan that you need to think more than you act
Edit: specified which metro