Here is the full list of all 42 Gunpoint achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Slam Fritz Gessler's office door into him.
Publish your personalised epilogue.
Complete the game.
Shoot Fritz Gessler.
Kick Fritz Gessler's office door into him.
Knock Fritz Gessler out of his office window.
Knock Fritz Gessler out with a punch.
Defeat Gessler by rewiring his gun.
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).
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.
Steal Gessler's technology for Rooke.
Upgrade your Bullfrog Hypertrousers to pounce instantly.
Mock the chief of police at a critical moment.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
Conceal your presence at the DataSec break-in from Mayfield.
Use the Dropshot to land silently from a great height.
Chicken out of telling Katie the truth at the last minute.
Create a custom mission with at least one objective.
Use no violence at all on a mission that has guards.
Complete a mission that has guards with no violence, witnesses or loud noises.
Knock a guard out by opening a door into him.
Get knocked down by an opening door.
Wire an elevator button to trigger something when the elevator arrives.
Leave no living witnesses to your presence on a mission that has guards.
Use the Crosslink to create an infinite loop that burns itself out.
Use the Prankspasm to knock out someone who isn't standing near a power socket (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 battery capacity to the non-figurative max.
Jump into an Enforcer to knock him through a window.
Complete a mission faster than I can.
Voluntarily tell Katie the truth.
Tell Gessler that Rooke's hired you to betray him.
Complete the police chief's missions without incriminating yourself.
Catch a guilty man at the expense of freeing an innocent one.
Beat Fritz Gessler to death.
Intimidate Fritz Gessler into surrendering.
Notice the story doesn't necessarily gel with the mechanics. Become qualified games journalist.