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