First thing can not be killed until he turns off the light, then shoot at him, or if you want to save a ammunition, lure him all the way to the stairs where the barrels are and it will catch fire.

Get the latest intel in the Norwegian camp, it is very important, after that go back to the U.S. Outpost 31 and on the table where they eat you'll see a document pick it up and read it.

Bennings in the laboratory can not be killed. Only when he tries to escape, keep eye on him time to time when you see the text that you have to find him, follow him and then kill him , after that go into MacReady room with computer and pick up the tape recorder, after that wait and see what will happen.

You will be infected if you touch something you're not supposed to, raptors will not occur for no reason, as more people lose, the less your chances of survival. When someone dies kill creeping thing, because if you don't, you or your friend will be the next infected.