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