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