Here is the full list of all 42 Gunpoint achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Steal Gessler's technology for Rooke.
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).
Mock the chief of police at a critical moment.
Create a custom mission with at least one objective.
Knock Fritz Gessler out of his office window.
Beat Fritz Gessler to death.
Slam Fritz Gessler's office door into him.
Shoot Fritz Gessler.
Defeat Gessler by rewiring his gun.
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.
Intimidate Fritz Gessler into surrendering.
Kick Fritz Gessler's office door into him.
Catch a guilty man at the expense of freeing an innocent one.
Use the Gatecrashers to kick a door through a window.
Use the Hushcracker to jump through a window silently (outside of the test lab).
Complete a mission faster than I can.
Use the Gatecrashers to kick a door off its hinges.
Use the Gatecrashers to kick a door into a guard.
Free an innocent man at the expense of catching a guilty one.
Complete the police chief's missions without incriminating yourself.
Upgrade your Bullfrog Hypertrousers to pounce instantly.
Help justify my early, not entirely wise choice of game name by holding someone at gunpoint with the Resolver.
Conceal your presence at the DataSec break-in from Mayfield.
Upgrade your battery capacity to the non-figurative max.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
This is an achievement in name only. No-one admires you for punching a guy that many times.
Use the Longshot to make a guard unintentionally shoot another (outside of the test lab).
Voluntarily tell Katie the truth.
Use the Crosslink to create an infinite loop that burns itself out.
Tell Gessler that Rooke's hired you to betray him.
Jump into an Enforcer to knock him through a window.
Wire an elevator button to trigger something when the elevator arrives.
Get knocked down by an opening door.
Use no violence at all on a mission that has guards.
Complete a mission that has guards with no violence, witnesses or loud noises.
Leave no living witnesses to your presence on a mission that has guards.
Use the Dropshot to land silently from a great height.
Knock a guard out by opening a door into him.