Here is the full list of all 40 Plunder Dungeons achievements.
Plunder 10 dungeons.
Plunder 50 dungeons.
Plunder 100 dungeons.
Plunder 250 dungeons.
Plunder 500 dungeons.
Collect 10 different elements.
Collect 25 different elements.
Collect 50 different elements.
Collect 75 different elements.
Collect all 100 different elements.
Collect 100 elements in total.
Collect 250 elements in total.
Collect 500 elements in total.
Collect 1000 elements in total.
Collect 2000 elements in total.
Encounter 5 different species of monster.
Encounter 10 different species of monster.
Encounter 20 different species of monster.
Encounter 30 different species of monster.
Encounter 40 different species of monster.
Encounter 50 different species of monster.
Encounter all 52 different species of monster.
Defeat 10 monsters.
Defeat 50 monsters.
Defeat 100 monsters.
Defeat 250 monsters.
Defeat 500 monsters.
Open 1000 coin chests.
Open 1000 item chests.
Bathe in 100 healing springs.
Bargain with 100 traders.
Wish on 100 statues.
Navigate 1000 empty squares.
Defeat the guardian of the forest.
Defeat the terror of the mineshaft.
Defeat the mischief maker of the desert.
Defeat the master of the grotto.
Defeat the legend of the volcano.
Defeat the ancestor of all monsters.
Learn about the creators of this world.