Here is the full list of all 19 Shardlight achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Figure out why the rebel doesn't speak.
Gus doesn't know art, but he knows what he hates.
Properly disposed of the severed arm.
You maintained the status quo.
Tip your hat to the new revolution.
An age of uncertainty, but of happiness.
You couldn't let a friend suffer.
You completed the game.
Played through the game with commentary.
Said the code phrase to everyone.
You're the most well-read person around.
You're never too old to have fun.
Gain Jess's trust.
Listen to every single comment Denby makes inside the factory.
Tasty, but think of your triglycerides!
You don't mind being poked and prodded.
Don't encourage him.
You drew the symbol correctly on the first try.
Nothing like a nice hot meal.