Here is the full list of all 12 The Tale of a Common Man achievements.
Rescue Aaydan
Get Rowath to Talk to Doalan's Dad
Find Lakeside Resort
Kill Bandit Chief
Admire the Boat
Kill Pirate Leader
Find the Soldiers in the Haunted House
Kill Jakktar
Recruit Boulder
Meet Phaltar
Rescue Feniel from Murder
Deal with your Archnemesis