Capturing or killing an animal with the hunting rifle, survival bow, snare, or fishing tackle will nullify the achievement. Therefore it is highly recommended that the player seek sustenance by scavenging meat from deceased animals killed by wolves and ransacking abandoned buildings.
This achievement must be made in the first twenty-five days of the play through. If the player kills an animal within the first twenty-five days of surviving it will nullify the achievement for that entire play through.
Wounding an attacking wolf that flees then dies does not affect earning this achievement.