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