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