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