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Its 100% safe to use
I got about 200k achievement's using that and i even know a guys who had 2m achievement's and there is not ban

There is no reason to have 100% achievement
It's just look's good on your steam profile to have many achievement's

You can use sam.picker for this
1-Download sam.pciker here[github.com]
2-login to your steam
3-Run the sam.picker
4-it will show all of the games that is listed in your steam library so you need to chose the game that you want to get all the achievement's and double click on in to run the game

5-If you cant find the game you want to get all the achievement's just go in store page of that game and there is code like in this photo . you copy that code and paste it like on this photo

6-There is 3 icon 🔒-🔏-🔓 like this . You need to click on this icon 🔓 and unlock all the achievement's

7-There is commit changes on the right top corner . Just click on that on its done you got all the achievement's

Maybe your steam silent wont work and it'll be not responding if there is to much achievement's like +1000 or more so you just need to close and lunch the steam again

There is special games on steam store that got many achievement's like +5000 achievement's and its rly good to farm them there is list of that games here[astats.astats.nl]