Finish the game without taking any fall damage or stepping into a bear trap.
Avoid taking any damage from Xaphan.
Kill a snake, dog, boar, wolf, owl, and bear.
Finish the game without using medkits or pills.
Use every key in the game and enter all places blocked by planks or roots.
Kill the beast using melee weapons only.
Finish the game without firing a single shot.
Finish the game.
Read all books, notes, and papers.
Listen to all radios in the game.
Read Bible.
Don't kill any psy aliens.
Kill 6 psy aliens.
Don't let the black shadows hurt you.
Finish the game without dying.
Finish the game without using save crystals.
Use save stones more than 40 times in one playthrough.
Find all alien skulls in one playthrough.
See the vision of the future.
Lure an enemy into a bear trap.
Find the book of the dead.