Easy "Camper" achievement
Travel to the lower right corner of the map. Go up the hill to find a campsite. Enter the tent found there.
Easy "Master of Darkness" achievement
To get a score of at least 600 points, collect batteries (worth 10 points each) and notes (worth 20 points each).
Easy "Notetaker" achievement
There are a total of five notes that must be collected. At the rear of the minefield on a pack. On the bridge over the river. In the railroad station on a bench. Outside on the wall of the house. In the other house, on the table near the zombie.
Easy "Camper" achievement...