Avg. Game Completion Rate - Question

[Jhordi]

Hello, I noticed something is not right regarding the Avg. Game Completion Rate. This is my case:

According to my profile, I have 71 Perfect Games with a 71% Avg. Game Completion Rate. So with those stats, I should have 100 games with at least 1 achievement. Right?

But the real question... according to my Achievement Showcase which shows every single game I have with at least 1 achievement (payed / free games, software), I have 105 games (I quadra checked this number) with at least 1 achievement that affect my Avg. Game Completion Rate... then why?

If I have 105 games with achivements and 71 Perfect games, my Avg. Game Completion Rate should be 67% or 68%, are some games not counting?

As far as I know, if you unlock at least 1 achievement on any game, it affects your Avg. Game Completion Rate, or maybe I'm not seeing something. Any ideas/thoughts? Thanks.

[Jerry]

While there are games, that do not count into the average (those, that have not enough sales yet to be considered proven by Steam; not relevant in your case), you are somewhat mistaken about the calculation.

The average completion rate counts the average of the rate, you got achievements in games, not the rate of your perfect games. To take a simple example, if you have one game cleared with 100% and four games with 25%, your average rate will be 40% (and not 20%).

[Jaunitta 🌸]

This
https://steamcommunity.com/sharedfiles/filedetails/?id=650166273
and this.
https://steamcommunity.com/discussions/forum/1/864974467434899969/