Reach depth 2.

Reach depth 5.

Reach depth 10.

Defeat the Skeleton King.

Defeat the Bone Sorcerer.

Unlock the Barbarian.

Unlock the Ranger.

Unlock the Mage.

Unlock all heroes.

Collect 1000 gold in total.

Defeat 500 skeletons.

Open 50 chests.

Defeat a boss without taking a hit.