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