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