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.
Red tree inside the Pit?
Walk under the waterfall.
Explore the corn field.
Explore the wrecked coal mine.
Find the old outpost by the river.
Find the Gorge.
Explore the maze.
Find the grave of the Fallen.
Explore the wooden windmills.
Magic under the Roar.
Find the hidden passage.
Explore the boats by the shore.
Explore the mine that goes on top of the mountain.
Visit the Tower.
Remember her neck tattoo.
Explore the Radio Station.
Visit the railroad and the train wreck.
Cross the wooden bridge.
Swords and Skulls.
Explore the Graveyard.
Explore the Church.
Explore the tombstones.
Wake up on the Island.