Here is the full list of all 42 Gunpoint achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Chicken out of telling Katie the truth at the last minute.
Slam Fritz Gessler's office door into him.
Knock Fritz Gessler out of his office window.
Intimidate Fritz Gessler into surrendering.
Beat Fritz Gessler to death.
Knock Fritz Gessler out with a punch.
Notice the story doesn't necessarily gel with the mechanics. Become qualified games journalist.
Defeat Gessler by rewiring his gun.
Kick Fritz Gessler's office door into him.
Catch a guilty man at the expense of freeing an innocent one.
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).
Tell Gessler that Rooke's hired you to betray him.
Complete the police chief's missions without incriminating yourself.
Voluntarily tell Katie the truth.
Jump into an Enforcer to knock him through a window.
Create a custom mission with at least one objective.
Complete a mission faster than I can.
Publish your personalised epilogue.
Complete the game.
Shoot Fritz Gessler.
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.
Free an innocent man at the expense of catching a guilty one.
Mock the chief of police at a critical moment.
Upgrade your battery capacity to the non-figurative max.
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.
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.
Steal Gessler's technology for Rooke.
Use the Hushcracker to jump through a window silently (outside of the test lab).
This is an achievement in name only. No-one admires you for punching a guy that many times.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
Leave no living witnesses to your presence on a mission that has guards.
Get knocked down by an opening door.
Knock a guard out by opening a door into him.
Use the Crosslink to create an infinite loop that burns itself out.
Wire an elevator button to trigger something when the elevator arrives.