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