Here is the full list of all 24 Oracle achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Find the old outpost by the river.
Explore the corn field.
Visit the ruins.
Explore the wrecked coal mine.
Red tree inside the Pit?
Walk under the waterfall.
Find the Gorge.
Explore the maze.
Find the grave of the Fallen.
Find the hidden passage.
Remember her neck tattoo.
Visit the Tower.
Magic under the Roar.
Visit the railroad and the train wreck.
Cross the wooden bridge.
Explore the Graveyard.
Explore the boats by the shore.
Explore the mine that goes on top of the mountain.
Explore the Radio Station.
Explore the wooden windmills.
Swords and Skulls.
Explore the Church.
Explore the tombstones.
Wake up on the Island.