minecraft on my new device says I've barely completed any achievements

I notice today when I was playing on my ipad it says i've only completed 3% of the achievements and I just got it a week ago and started playing today. While on my fire tablet I've been playing since 2016 signed in in 2018. Multiple have broke so when I got a new one and signed back into minecraft my game score was the as when I've played last time. I play on both devices with the same account. On the Fire tablet my gamer score is 830/2820 37% of achievements completed. While on my ipad my gamer score is 35/2820 3% of achievements completed. The top one is my iPad the bottom one I the fire.