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