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