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