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