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