Here is the full list of all 21 The Low Road achievements.
Ruthlessly destroy a rival corporation
Create a giant tin-can telephone
Reach the roof without using violence
Take a prank phone call too far
Successfully complete Lacey’s phone call
Convince Lacey of your paranormal gifts
Complete Hab's Rhyme puzzle without a mistake
Deliver the flyers without alerting Thornton
Use Horace as a drop point for the plant
Try out a hideous nickname
Collect all 5 false endings in one playthru
Spot the Docillio barge from Rev Island
Use your knowledge of Pierre La Piette to distract Penderbrook
Reveal your true nature with the push of a button
Unseat the Soothmaker in a battle of wits
Spurn your fellow agent and complete your mission alone
Coddle your fellow agent and complete the mission together
Get Horace to wash his hair five times
Bypass the age restrictions of a violent film
Invent a new hair-removal product
Drive the Fikus around the test track five times