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