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