My highest was 52 digits :)
Fun story: When I was in elementary school, a pi learning app briefly became popular. I aggressively memorized the number at the time, and have been able to recite around 100 digits ever since.
That said, I've never had to recite pi under time constraints like this. It's a little stressful but quite fun!
I did run into one bug. I think if you quit the game early, the timer doesn't reset and your next attempt will be shorter.
Otherwise, nice work!
Edit: I read in the other comments that the last achievement is at 60, so I went back and got it!