I wish we could delete all achivements for a game easily - The story of the evolution of a gamer

Recently I've been playing Payday 2 again. A game I discovered when I was 13 years old, and played with my 10-year-old brother. (30 Juin 2015 to be precise, but who counts) We didn't have any money (and our parents didn't want us to play violent games but play nice games [and watch Jason Bourne with them after hum hum] but found the demo of Payday 2 super fun, and played the 2 missions over and over again. One day we discovered online that we could have a plugin, that would give us access to the locked weapons and masks in the Payday 2 demos, and the fun quadrupled for us! Years passed, and we had this thing called Christmas money, we bought with it Steam card, and bought a cool game called "Payday 2" not the demo. (22 January 2017 to be precise, but who counts) Well it turned out that what we found fun in the game was just trying cool guns, and stupid builds, and making masks. And we downloaded cheats for the game again, not to ruin the fun of others, but to unlock what we found fun in the game and have a good time.

Recently (7 years later wow) we wanted to play again, and discovered that there was a "Carrier mode" to help us choose missions, (something we rarely did before because there was too much choice, we instead played basically the same heists we knew because of the fear of choosing), And we are having a blast rediscovering a game we love (With the cool masks that never disappeared yay) but I do feel personally bad for seeing "1302/1328 Achievement" I never did all of those, I randomly clicked a button in English I did not fully understand one day and got all of those. I looked how to delete them, you basically have to do them one by one and I feel a bit bad, because I'm not part of those "7% of people that finished the [Dodge This] achievement, I don't even have the weapon. It's dumb but it makes me a bit sad that's all. Wish we could delete all of them in 4 or 5 clicks.

PS: If anyone has a way to see how much time you have played a demo, I would love to know, I'm curious if I've played more the Demo than the real game as of now