Here is the full list of all 36 Rogue Islands achievements.
Eat 20 food item.
Eat 100 food items.
Save yourself from starvation.
Die 5 times.
Die 10 times.
Spend 5 hours on the islands.
Spend 10 hours on the islands.
Spend 50 hours on the islands.
Defeat The Prime Torment.
Defeat The Prime Torment 3 times.
Defeat The Prime Torment in Nightmare mode.
Defeat The Prime Torment in Hardcore mode.
Unlock all Raw spells.
Unlock and fully upgrade all Raw spells.
Gain the Vital Twig wand.
Unlock all Earth spells.
Unlock and fully upgrade all Earth spells.
Gain the Charred Switch wand.
Unlock all Fire spells.
Unlock and fully upgrade all Fire spells.
Unlock all Spells.
Unlock and fully upgrade all spells.
Defeat The Silken Mother.
Defeat Horik.
Defeat The Bloat.
Read from a Scroll of Teleportation.
Meditate in Vita's energy.
Craft an Imbued Diamond.
Craft an Imbued Emerald.
Craft an Imbued Ruby.
Craft a Ship Fuel.
Hold 100 Spirit Dust.
Hold 200 Spirit Dust.
Gain maximum Adamant.
Gain maximum Flamestone.
Gain maximum Mana.