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