Here is the full list of all 17 Burial Stone Demo achievements.
Reached first floor
Reached second floor
Reached third floor
Traded with the shop keeper
Learned Fierce Slash talent
Learned Fierce Hack talent
Learned Fierce Club talent
Learned Cross Slash talent
Learned Blood Cleave talent
Learned Blunt Club talent
Learned Fire Bolt spell
Learned Radiant Light spell
Learned Magic Shield spell
Learned Chain Lightning spell
Learned Piercing Light spell
Learned Regain Health spell
Reached the end of the Demo