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