I went onto my single-player world to play for a moment yesterday, which updated my world from 1.18.1 to 1.18.2, and I got the achievements for picking up obsidian and wearing iron armour, which is odd because I already got those. And today I began to do some work on a village house, and I got the achievement of picking up cobblestone.

So, I went into my statistics, and lo and behold, they only displayed the movement, etc that I had done over the past two days, and that I had killed a skeleton, plus all the items I had used in some way