Walkthrough guide

1. Collect at least 4 unique fossils and identify them at the fossil box.

2. Rest at the tent and you will see a dream. This dreams tells you the location of a landmark that appeared overnight.

3. Find the landmark and examine it to get another clue. This clue will show you a pair of coordinates.

4. Equip the compass and match the coordinates at the bottom of the screen to the coordinates shown in the clue. When you are standing in the spot that the coordinates point to (your radar will not light up for these spots), try digging, and you will find a new item.

5. Go to the fossil box to identify this new item and then rest at the tent to continue the story. Repeat this until you have found all the non-fossil items and a new area will open up.

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Here are the landmark locations in order and the dig spot given by the landmark's clue note:

1. "A terrible beast... Emerges from the sand... North west..."
Landmark location: x-40, y-49
Dig spot: x63, y14

2. "To the north... Behind the visitors... Where bones rest..."
Landmark location: x41, y-59
Dig spot: x18, y71

3. "A picture of the past... To the west... By the sands... Writ upon the rock..."
Landmark location: x-67, y13
Dig spot: x06, y41

4: "An invitation... For a special day... West... On a platform of stone... Alongside a winding path..."
Landmark location: x-24, y20
Dig spot: x12, y30

5: "Hidden between earth and stone... My burrow... North west... A path of sand..."
Landmark location: x-60, y-56
Dig spot: x50, y50

After you have discovered all the special finds, sleep again then go to the area where you found the burrow (x-60, y-64) and go through the hole to the mine.

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Endings:

To get the bad ending, go to the end of the mine and wait for a minute, then the ending will play

To get the good ending, when you're in the mine, don't go to the end. Instead follow the paths marked by signs. The path with the triangle sign (it looks a bit like an arrow) leads to a clue to find a key. The path with the rectangular warning sign leads to a room with lockers. On the wall of this room is a poster and, as the clue in the other room suggests, if you dig in front of that poster you will find a key. This time instead of waiting after going to the end of the mine (you still need to watch the cutscene where you find Gramps), retrace your steps and open the gate with the key you found.
Congratulations! You got the good ending!