The World Needs Guts
The Fabulous Five spokeman outside the entrance of the King Crab Inn can be told that the sailors are looking for work.

Zero the Hero
Lie, and tell Aureus that his Legionnaires are brave heroes, ensuring them a ticket home.

Forgiven
Convince Desdemona to forgive Samson.

Voices From the Past
Confront Ebenezer about his sick past. Choose the option to send him to the Hall of Echoes. Be prepared for a fight. (immune to freezing if you have it...)

It Could Be Mine
Tell Cecil that you are keeping the staff.

Wrecking Ball
In western Cysael, next to the Cysael West portal, is a wrecked house with a trapdoor hidden by a rug (X=35, Y=145). Downstairs is a sarcophagus. Drag the lid off of it (simply clicking on it does not work), to release Snorri the phantom. Talk to him, and he will give you a challenge to destroy a blue orb within a 35 second time limit. This achievement, however, is unlocked by failing to do so, which will cause Snorri to demonstrate how to do so by breaking it himself.

The One That Got Away (miss-able)
This one requires you to botch the murder investigation quest. After finding all three clues implicating Esmeralda, talk to Aureus to have her thrown into jail. Go to Esmeralda's general store and watch the scene where a Legionnaire spawns and escorts Esmeralda away.