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