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