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