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