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