Here is the full list of all 52 Skinwalker Hunt achievements.
Kill skinwalker in the Longwind Valley level.
Kill an owl.
Kill owl, snake, boar, wolf, bear and the deer.
Kill 5 deer.
Destroy 3 skinwalker totems.
Kill worshiper.
Make 35 headshots.
Clean the old double-barreled shotgun using a gun cleaning kit.
Deal damage to skinwalker with a bear trap.
Locate 3 skinwalker footprints.
Kill 5 wolves.
Deal damage to skinwalker.
Find a shotgun.
Kill 5 bears.
Kill 5 boars.
Kill 5 creatures using tomahawk.
Touch ancestor spirit.
Catch 4 fishes.
Kill 10 enemies with a shotgun.
Hunt down and kill skinwalker without dying.
Hunt down 50 animals.
Kill 3 snakes.
Find the weird looking skull in Longwind Valley.
Kill 5 skinwalkers.
Kill 30 deer.
Kill 30 bears.
Kill 30 boars.
Kill 30 wolves.
Scare animals with a red flare 3 times.
Enter skinwalker cave in Longwind Valley.
Find and take 50 items.
Consume 10 healing plants.
Find weird looking mushroom in Chernobyl forest.
Find the radiation resistance kit.
Hunt down skinwalker with "Hide my position on map" enabled.
Kill skinwalker in the Chernobyl Forest level.
Find and shoot the creepy nailhead doll in the Chernobyl Forest level.
Kill 10 owls.
Kill possessed crow that is flying towards you.
Craft a bear trap from parts of two broken bear traps.
Cook 30 pieces of meat.
Kill 20 enemies with silenced rifle.
Find the book of the dead.
Become ultimate hunter.