Here is the full list of all 50 Icewind Dale: Enhanced Edition achievements.
Memorized Malavon's Rage.
Killed Icasaracht, the White Dragon matriarch.
Completed Heart of Winter.
Visited the Sea of Moving Ice.
Brought a rose of ice to the bard, Murdaugh.
Acquired the Singing Blade of Aihonen.
Assisted the dwarven smith Tiernon to forge an ice weapon.
Visited Gloomfrost.
Discovered the true identity of the Lonelywood werewolf.
Acquired the infernal Vexed Armor.
Visited the Burial Isle.
Completed Trials of the Luremaster.
Visited the ruined castle in the Anauroch desert.
Acquired the Restored Blade of Aihonen.
Completed Icewind Dale.
Killed Belhifet.
Revisited Easthaven.
Restored the Arboretum to its former glory.
Turned Malavon's Iron Golems against him.
Acquired the Black Swan Armor.
Killed Joril, the leader of the Frost Giants.
Freed all slaves in the Wyrm's Tooth glacier.
Reach 150 Hit Points.
Visited Wyrm's Tooth Glacier.
Killed Terikan, the Lich.
Reduce Armor Class to -15 or lower.
Visited Dorn's Deep.
Killed 1,000 creatures.
Visited the Severed Hand.
Killed Yxunomei, the Marilith demoness.
Visited Dragon's Eye.
Visited Kuldahar.
Sang to the Sea Spirit Elisia.
Become a Fallen Paladin or a Fallen Ranger.
Have six party members who are evil-aligned.
Have six party members who are good-aligned.
Increase an attribute score to 25.
Have six party members who are neutral-aligned.
Obtain Grand Master weapon proficiency level.
Obtain a Lore skill of 100 or more.
Found Pale Justice, the Holy Avenger sword.
Complete the game with only a single party member.
Complete the game on the Heart of Fury difficulty setting.
Complete the game on the Story Mode difficulty setting.
Reach level 30 with a Mage or Sorcerer.
Reach level 30 with a Thief or Bard.
Reach level 30 with a Fighter, Ranger, Paladin, Monk, or Barbarian.
Reach level 30 with a Cleric, Druid, or Shaman.
Reach level 30 in two classes with the same character.
Reach level 30 in three classes with the same character.