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