Contact support click on the game and ask them to delete perminently
Well its perminently gone until want it back

https://steamhelp.yuanyoumao.com/en/

Thanks for trying to help.
I have already been successful at removing the game from my account, but it still showed up as a perfect game. I guess if you get all achievements in a game, you are stuck with it on your stats for all eternity.

Your stats stay with you even if you remove/refund the game.

You never truly remove a game, even if you ask support to do it. You'll find you can't buy it again even if you wanted to as the key is still tied to your account.

This prevents issue where people get their accounts hijacked and the games get deleted by the person who's taken it over as it allows support to restore the games once they recover the accounts.

It's not going away. If you managed to 100% a game during a free weekend and never actually owned the game, your account will show that you did 100% it, even after the free weekend ends. Pretty sure this also applies to games played through 'Family Sharing' as well.

引用自 A Guy on a Buffalo：

Hello,
I purchased a naughty game and want to remove it from my account. I've successfully done that, but it still shows as a perfect game since I unlocked all the achievements. I used the Steam console to reset my progress on the achievements successfully, but it still shows up as a perfect game on my account. Is there any way to expunge it from my account, or will I forever be reminded of my bad decision from a couple of years ago?

I did the same i had many games like that on 100% and after i removed them they were gone from my accound like someone up there said you cant buy it again you can just re activate it but normally till you do that is should be gone from your account. It could be a bug from Steam like i had but i had the Bug that those games didnt disappeared from my Lately Played List. I looked on my second account and there it wasnt showen so its a Client based Bug if you have a second Account just try to look it up normally if you do it right on deleting the game it shouldnt get displayed until you re activate the Game. And after i think 2 Months my Lately Played list got ''Fixed'' so it was gone from my normal Account too.

РАП

UPDATE: I was just perusing my profile, and it was removed from my perfect games list. I'm guessing the achievement reset did it along with restarting steam after. Thanks everyone for contributing or trying to help!

all you have to do is take away some achievements through the Sam Picker application mark your game private then unprivate it and the game will no longer be in your perfect games tab.

引用自 VeeDee：

all you have to do is take away some achievements through the Sam Picker application mark your game private then unprivate it and the game will no longer be in your perfect games tab.

Thank you very much. Just enough to make one game private so that the perfect games list will update, and remove all games without 100% achievements.

What needs to be done:
1. download game stats editor here
https://github.com/gibbed/SteamAchievementManager/releases/tag/7.0.37
2. unlock
3. commit
4. unprivate the game

You stats will be cleared and game will not be listed on perfect games. If you skip step 4 it will still be there until you unprivate it to let settings to propagate

This thread was quite old before the recent posts, so we're locking it to prevent confusion.