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