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