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