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