Reach the prison.

Use 10 doses of Lichen.

Escape from the deep one.

Using sonar, reveal the invisible tentacles of the citadel's guardian.

Cross the maze.

Reveal 25 different clues using sonar frequencies.

Reconstruct Mei's drawing.

Analyze 25 clues

Find all energy upgrades.

Find 10 sub-clues by inspecting objects.

Find Mei in the Other World.

Teleport using the Star of Shamash.

Replace the watcher.

Translate the temple inscriptions.

Restore the seal and destroy the deep one.

Unlock a yith mechanism using sonar.

Finish the game without exceeding the corruption threshold.

Get the Star of Shamash.

Find all evolutions.

Prevent Cthulhu from awakening.

Solve 15 deductions.

Reactivate the PIT station.

Cross the maze without reassembling the cursed totem.

Leave the Other World.

Open the door without letting the matter spill out.

Reach the star without killing the guardian.

Translate the language of the great race of Yith.