Here is the full list of all 11 Unsung Warriors - there are Prologue achievements.
Find the Cavern of Names inside the crypt.
Destroy the skeleton boss by using only your fists as a weapon.
Collect 500 gold.
Destroy an enemy with a bomb.
Drop a box on an enemy
Destroy an enemy with an oil lamp.
Save the lost brother from the crypt.
Defeat the skeleton boss.
Destroy an enemy by stabbing him in the back.
Destroy an enemy by smashing him into spikes.
Destroy an enemy by pushing him under a crushing block.