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