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