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.
Upgrade your battery capacity to the non-figurative max.
Complete a mission faster than I can.
Intimidate Fritz Gessler into surrendering.
Beat Fritz Gessler to death.
Knock Fritz Gessler out of his office window.
Create a custom mission with at least one objective.
Use the Prankspasm to knock out someone who isn't standing near a power socket (outside of the test lab).
Free an innocent man at the expense of catching a guilty one.
Tell Gessler that Rooke's hired you to betray him.
Kick Fritz Gessler's office door into him.
Slam Fritz Gessler's office door into him.
Defeat Gessler by rewiring his gun.
Use the Longshot to make a guard unintentionally shoot another (outside of the test lab).
Voluntarily tell Katie the truth.
Knock Fritz Gessler out with a punch.
Jump into an Enforcer to knock him through a window.
Complete the police chief's missions without incriminating yourself.
Publish your personalised epilogue.
Complete the game.
Shoot Fritz Gessler.
Catch a guilty man at the expense of freeing an innocent one.
Knock a guard out by opening a door into him.
Mock the chief of police at a critical moment.
Upgrade your Bullfrog Hypertrousers to maximum jump strength.
Use the Hushcracker to jump through a window silently (outside of the test lab).
Conceal your presence at the DataSec break-in from Mayfield.
This is an achievement in name only. No-one admires you for punching a guy that many times.
Steal Gessler's technology for Rooke.
Chicken out of telling Katie the truth at the last minute.
Use the Gatecrashers to kick a door through a window.
Upgrade your Bullfrog Hypertrousers to pounce instantly.
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.
Use the Crosslink to create an infinite loop that burns itself out.
Use the Gatecrashers to kick a door into a guard.
Help justify my early, not entirely wise choice of game name by holding someone at gunpoint with the Resolver.
Use the Dropshot to land silently from a great height.
Use the Gatecrashers to kick a door off its hinges.
Get knocked down by an opening door.