It's not letting me get the achievement even tho I have done it twice

It's not letting me get the achievement. I tried to see if they weren't up dated so I updated the maps. I also tried making a locator map a 3 by 3 and a non locator map3 by 3 nothing worked they were all up to date of my world. It's really dumb Bc that's the last one I need intil I'm done with al the achievements. Please fix this mojang I just want this achievement done. It's a no cheat world and I made sure. When you go to game settings at the top it will say achievements cannot be earned on this world but it's not there so no cheats!!!!!