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