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