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