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