How can i trigger map achievements? I see that Walker can trigger them, but i cannot figure out how it is triggered.

I first thought that it might be triggered by Player stats: sbox-walker/code/PlayerStats.cs https://github.com/Facepunch/sbox-walker/blob/main/code/PlayerStats.cs

But i don't see any of those stats popping out in my map stat's page, so i'm confused