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.
Defeat Gessler by rewiring his gun.
Kick Fritz Gessler's office door into him.
Knock Fritz Gessler out of his office window.
Beat Fritz Gessler to death.
Jump into an Enforcer to knock him through a window.
Notice the story doesn't necessarily gel with the mechanics. Become qualified games journalist.
Shoot Fritz Gessler.
Intimidate Fritz Gessler into surrendering.
Knock a guard out by opening a door into him.
Use the Prankspasm to knock out someone who isn't standing near a power socket (outside of the test lab).
Mock the chief of police at a critical moment.
Voluntarily tell Katie the truth.
Tell Gessler that Rooke's hired you to betray him.
Chicken out of telling Katie the truth at the last minute.
Use the Longshot to make a guard unintentionally shoot another (outside of the test lab).
Create a custom mission with at least one objective.
Complete a mission faster than I can.
Complete a mission that has guards with no violence, witnesses or loud noises.
Publish your personalised epilogue.
Complete the game.
Knock Fritz Gessler out with a punch.
Use the Gatecrashers to kick a door through a window.
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.
Leave no living witnesses to your presence on a mission that has guards.
Help justify my early, not entirely wise choice of game name by holding someone at gunpoint with the Resolver.
Use the Hushcracker to jump through a window silently (outside of the test lab).
Steal Gessler's technology for Rooke.
Conceal your presence at the DataSec break-in from Mayfield.
Get knocked down by an opening door.
Upgrade your battery capacity to the non-figurative max.
Wire an elevator button to trigger something when the elevator arrives.
Use the Dropshot to land silently from a great height.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
Use no violence at all on a mission that has guards.
Use the Crosslink to create an infinite loop that burns itself out.
Upgrade your Bullfrog Hypertrousers to pounce instantly.
This is an achievement in name only. No-one admires you for punching a guy that many times.