name='hhhhancock']I collect British World War II films made between 1939 and 1969, in those terms I could be considered a completist (still need about 20) but I realise I'm copping out by not collecting all films from 1969 on.
I've tried to be completist with other collections and usually given up mainly because of the cost involved. I had a large collection of Giles Annuals but found the early ones were just beyond my resources. Same with Gideon books.
The only collection I can say is complete would be the original Observer books, after about 5 years I now have 'em all.