Here is the full list of all 69 Diehard Dungeon achievements.
Attain Champion rank.
Obtain Scatter ability.
Attain Hero rank.
Defeat Hive Mind.
Attain Slayer rank.
Defeat 200 enemies by setting them on fire.
Obtain Slash ability.
Achieve rank 10 in Mayhem.
Attain Adept rank.
Defeat Giant Oaf.
Attain Valiant rank.
Defeat Evil Chest.
Defeat Mr Illusion.
Avoid opening 10 chests.
Destroy 20 chests.
Avoid picking up 20 hearts.
Obtain Houdini ability.
Defeat 2000 enemies.
Use 50 tokens.
Obtain Reflex ability.
Pickup 100 hearts.
Obtain Attract ability.
Obtain Lightfoot ability.
Obtain Triple Shot ability.
Escape the dungeon.
Open the gold chest.
Defeat Zombie Chest.
Destroy 300 lights.
Attain Warrior rank.
The Companion Chest upgrades to its maximum level.
Obtain Looter ability.
Obtain Knives ability.
Obtain Iron Grip ability.
Obtain Trigger Happy ability.
Have 20 tokens.
Obtain Voodoo ability.
Defeat Stumpy.
Obtain Pierce ability.
Destroy 1000 containers.
Obtain Heartbreaker ability.
Obtain Toasty ability.
Collect 10,000 treasure.
Obtain Fireproof ability.
Obtain Forget-Me-Not ability.
Obtain Vision ability.
Obtain Heavy Duty ability.
Obtain Courage ability.
Attain Fighter rank.
Obtain Kaboom ability.
Obtain Repel ability.
Obtain Sense ability.
Obtain Mithridate ability.
Attain Legend rank.
Attain Diehard rank.
Defeat the Dungeon Master.
Escape the dungeon in Champion Mode.
Win a Trapdoor game.
Use 20 Teleporters.
Obtain Dash ability.
Destroy 500 containers with fire.
Survive 20 rooms of Survival
Escape the dungeon at Diehard rank, in Champion Mode, and defeat the Dungeon Master.
Complete Fading Light in under 3 minutes.