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