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