Running across the long chain

Acquire Gauntlet of Zeus

Break the Chains of Tartarus

Break out of stone status 5 times in a row

Awaken all three horses

Acquire the Triton Lance

Find ballista secret

Execute a 1000-hit combo

Upgrade any weapon

Kill the Persian King

Cause the Basilisk to retreat

Craft 5 items.

Use a merchant to repair an item.