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