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