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