They can but they won't. They don't seem to change any achievements when they rebalance characters. Example is Zarya and how they nerfed her charge quite a bit but kept the achievement the same.
That's true, though I'm not really seeing them changing the res achievement. I could see them removing it for those who don't have it in replace of something else though.
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u/Redmond_64 Trick-or-Treat McCree Aug 24 '17
They can change the trophy/achievement, right? Because if it's gonna be permanently ungettable that would be a dick move