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