Completed in the Swamp Fever Campaign, Swamp Chapter
In the Swamp Fever campaign, there is a crashed plane in the second chapter.
There are fully locked doors inside. According to the plot, the survivors need to go there, and there will be no other way. After opening the doors, depressurization begins, which captures the hordes of the infected for the survivors.
To get achievements, you need to hide in reconnaissance and repel the attack of the infected. Your task is to survive all the waves without losing a single point of health. The rest can take damage. Achievement does not earn Anyone who has received at least 1 damage.
Many players fail to get this achievement. I don't know why, because there is nothing directly supernatural here. So try to get it on all difficulty levels.
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SECOND METHOD if it is usually difficult to obtain
Mod for playing without spawning all infected:
Mutation Mod ►
https://steamcommunity.com/sharedfiles/filedetails/?id=12107...(I condemn cheats)