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