Achievement for Movement Keys

I recently incroduced my brother to Minecraft, and when he first played, he saw a achievement. It was a achievement you get went you first load minecraft, and it shows what are the movement keys. He then told me, "why is the THINGY showing letters?" I told him, "to help you get a hang of the game." he responded with, "but why didn't it say greet me with manners?" I have spent a whole day not trying to figure out how to make a add-on for this sort of achievement, but I realized, wait this is such a small little feature that takes no time at all. I even when on to an achievement generator site and created a concept of such a achievement:

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