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