Here is the full list of all 20 The Parallax Effect achievements.
Kill an animal and harvest its corpse.
Heal your wounds with a medicinal item.
Conduct some exploration under the moonlight.
Obtain an item that can assist your survival.
Consume a tasty snack or beverage.
Find your way to the Chimera wilderness.
Find your way to Greenstone, the largest township in all of Chimera.
Show you can brave the terrors of the night and live to tell the tale.
Build something to keep yourself warm.
Find another survivor of the effect.
Construct a bedroll to rest upon.
Fortify yourself with defences.
Find and raid an Alpha clan base.
Arm yourself with a powerful weapon.
Inject yourself with an unknown serum.
Call in some support from the skies.
Obtain a piece of metal armour.
Enter the dead zone and find Bunker 47.
Travel a total of 10km's on foot.
Kill the corrupted beast known as The Reaper.