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