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