So my friend has the garry achievement for gmod, and I’ve read other threads and wiki’s and it claims that its impossible to get it. He claims that he got it from a jailbreak server from a hacker, is this true??
Link to the dude’s achievements for gmod: http://steamcommunity.com/profiles/76561198095340629/stats/GarrysMod/?tab=achievements
wow dude, this is really rare! i can do you a favour too if you like bro 
Anyone who googles a certain group of words that leads them to a link to a certain program can just give themselves achievements. I could give myself that achievement right now if I cared to.
He could’ve gotten it legitimately, but he could’ve also not.
There was an exploit 1 or 2 years ago that allowed users to change their steamID sent to the server and therefore giving people the achievement for it. Here’s a video of me doing it at the time [video]https://youtu.be/G6mPM0F69N0[/video]
Can I have an explanation for this? 4 Garrys joined my server when this was popular. I know it doesn’t work anymore, I’m just interested in how it’s done.
Most people use steam achievement manager