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