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