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