When you put seeds in a composter it gives you the "you need a mint" achievment

I was playing with my sister on a minecraft world and we needed bonemeal so we put seeds in a composter then collected the bonemeal and it gave her the "you need a mint" achievement(I already had it). That happened on my Xbox. Then about 30 minutes on my iPad I put seeds in a composter and got the "you need a mint" achievement. I don't think anyone else has found this as composers aren't used often.