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