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