When i tired to do any achievement including Killing the ender dragon and entering the end it wouldn't let me get a single achievement and no i'm not using cheats nor am i using creative (the problem is i had a tough time beating the dragon sense my diamond armor broke to only pants) but when i did a achievement hours before this happening (curing a zombie villager) it let me have it.  the achievements i did but didnt earn were, Dispense this, on a rail, sniper duel, taste of your own medicine, the end?, the end, beam me up, feeling ill, cheating death, kill the beast, we're being attacked,  total Beelocation.  Please help Mojang i don't know why this happened and i just tired On the rail again