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