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