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