Here is the full list of all 38 DUNGEON ENCOUNTERS achievements.
Reach the Underworld.
Unlock all achievements.
Chart every tile.
Acquire all abilities.
Compile profiles on all fiends.
Deal more than 100,000 damage with a single attack.
Find and befriend all members of the Academy.
Reach Floor 99.
Chart 88,000 tiles.
Acquire 30 abilities.
Compile profiles on 75 fiends.
Deal more than 50,000 damage with a single attack.
Reach Paradise Lost.
Reach the Undulating Sands.
Reach the Molten Crags.
Reach the Blasted Wastes.
Reach Forgotten Glory.
Reach the Enshrouding Mists.
Reach Fading Twilight.
Reach the Glacial Tomb.
Reach the Rift Beyond.
Chart 10,000 tiles.
Chart 20,000 tiles.
Chart 30,000 tiles.
Chart 40,000 tiles.
Chart 50,000 tiles.
Chart 60,000 tiles.
Chart 70,000 tiles.
Chart 80,000 tiles.
Acquire 10 abilities.
Acquire 20 abilities.
Compile profiles on 25 fiends.
Compile profiles on 50 fiends.
Deal more than 1,000 damage with a single attack.
Deal more than 3,000 damage with a single attack.
Deal more than 5,000 damage with a single attack.
Deal more than 10,000 damage with a single attack.
Deal more than 20,000 damage with a single attack.