unable to ern any more achievements in my realm after getting cover me in debris.

Once I got the my 51 achievement cover me in ancient debris in my realm I tried to get the enchanter achievement then the stayn' frosty achievement and finally the alternative fuel source which would've gotten me up to 54 achievements but I didn't get them. This could only be for realms but since I haven't tried it outside of my realm I don't know.