If you reload the page then your achievements will NOT save, and if you find that you haven't gotten another one, press the flag again and you'll be able to find them all eventually. Another thing: If you do any "actions" while an achievement is up, it'll void any new achievements. IDK MAN. I can code. But did I ever say I could do it WELL?
Based on The Waiting Game by @purplecatguy (detector code from there)