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