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