Achievement should be something that you achieve through effort; often it is considered a goal, short and long term alike. Quite often those achievement would be notable; one can note a Ferrari, a framed diploma in someone's office etc.
But you don't see framed photos of someone stuffing as many sausages or eggs into their egg to get into Guiness' book of records. Neither does doing a double backflip over the trash can count as an achievement.
Let's draw a clear line, shall we? Getting into Guiness is an achievement. How you got there is NOT.