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