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