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