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