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