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