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