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