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