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