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