Keep your Haste burn meter above 50% for 10 seconds.

Hear a Foghorn echo.

Obtain all other trophies.

Find a use for the relics.

Complete all side quests. One way or another.

Solve all fish shrine puzzles.

Use Mixed Bait to attract 3 different species to a single spot.

Use Atrophy on a fishing spot a long way away.

Spot a fish of each category through your Spyglass.

Visit every dock in the game.

Relinquish the Necklace.

Research all engines.