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