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