Here is the full list of all 29 Salt achievements.
Fish up a Dragon Fish.
Dig up some buried treasure
Obtain a legendary item.
Kill the Spider Queen.
Obtain the Golden Compass.
Map 100 islands at 100% accuracy.
Decorate your boat with a painting.
Hold at least 50 lore books in your inventory.
Obtain over 10,000 gold.
Craft the Pardon Pusher.
Craft The Maiden.
Obtain a Hightop Bloom Flower.
Sail past the 1000 unit mark.
Obtain a set of Turtle Armor.
Fish up a Gigantic Mouth Seabass.
Defeat the Dark Guardian
Obtain the Loreman's Lofty Axe.
Defeat Draegan on Hardcore Mode.
Obtain the Druid Spirit Idol.
Get the Jungle Skimmy boat.
Obtain all journal inks.
Obtain the Lucky Fisherman's Hat.
Defeat every boss in the game.
Complete the main quest line.
Complete every merchant quest in the game.
Hunt and kill The Alpha Stag.
Place a flag on a very tall mountain.
Purify the Ancient Skull.
Knock fruit from a tree and shoot it with an arrow before it hits the ground.