Here is the full list of all 20 The Parallax Effect achievements.
Find your way to the Chimera wilderness.
Obtain an item that can assist your survival.
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.
Consume a tasty snack or beverage.
Build something to keep yourself warm.
Heal your wounds with a medicinal item.
Find another survivor of the effect.
Construct a bedroll to rest upon.
Conduct some exploration under the moonlight.
Fortify yourself with defences.
Find and raid an Alpha clan base.
Arm yourself with a powerful weapon.
Kill an animal and harvest its corpse.
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.