Here is the full list of all 42 Gunpoint achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Catch a guilty man at the expense of freeing an innocent one.
Tell Gessler that Rooke's hired you to betray him.
Use the Hushcracker to jump through a window silently (outside of the test lab).
Chicken out of telling Katie the truth at the last minute.
Voluntarily tell Katie the truth.
Defeat Gessler by rewiring his gun.
Slam Fritz Gessler's office door into him.
Intimidate Fritz Gessler into surrendering.
Use the Gatecrashers to kick a door through a window.
Use the Crosslink to create an infinite loop that burns itself out.
Use the Prankspasm to knock out someone who isn't standing near a power socket (outside of the test lab).
Complete a mission faster than I can.
Use the Longshot to make a guard unintentionally shoot another (outside of the test lab).
Create a custom mission with at least one objective.
Publish your personalised epilogue.
Notice the story doesn't necessarily gel with the mechanics. Become qualified games journalist.
Complete the game.
Knock Fritz Gessler out of his office window.
Kick Fritz Gessler's office door into him.
Beat Fritz Gessler to death.
Knock Fritz Gessler out with a punch.
Shoot Fritz Gessler.
Use the Gatecrashers to kick a door off its hinges.
Use the Gatecrashers to kick a door into a guard.
Free an innocent man at the expense of catching a guilty one.
This is an achievement in name only. No-one admires you for punching a guy that many times.
Steal Gessler's technology for Rooke.
Mock the chief of police at a critical moment.
Upgrade your battery capacity to the non-figurative max.
Complete the police chief's missions without incriminating yourself.
Use no violence at all on a mission that has guards.
Complete a mission that has guards with no violence, witnesses or loud noises.
Help justify my early, not entirely wise choice of game name by holding someone at gunpoint with the Resolver.
Conceal your presence at the DataSec break-in from Mayfield.
Use the Dropshot to land silently from a great height.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
Knock a guard out by opening a door into him.
Get knocked down by an opening door.
Leave no living witnesses to your presence on a mission that has guards.
Jump into an Enforcer to knock him through a window.
Wire an elevator button to trigger something when the elevator arrives.
Upgrade your Bullfrog Hypertrousers to pounce instantly.