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