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