Curse of the Old Gods

When facing Clayton in the final area, shoot him in the face instead of in the third eye.

Complete the game while holding neither the coin nor the statue.

In the mall, exchange the coin for the statue then give the statue to the officer in the mobile HQ before leaving the mall. Complete the rest of the game to receive this achievement.

Alternatively, do not exchange the coin for the statue, then throw the coin into the well at the professor's house before completing the rest of the game.

In the mall, when restoring the data from the damaged camera, type in dsc0003.raw and view the image.

In the mall, exchange the coin for the statue and take it with you when you leave. Complete the rest of the game to acquire the good ending and this achievement.

In the mall, do not exchange the coin for the statue and do not throw the coin into the well at the professor's house. Complete the rest of the game and attempt to use the coin on the ritual circle in the final scene.

In the mall, do not exchange the coin for the statue. At the professor's house, use the coin on the well.