in case you mean "browseable" assemblies yes, as far as I am concerned these are all the publicly available ones to date.
but if you want human genome assemblies for deeper analysis, doesn't the 1000 Genomes data suit your needs? you can even consider digging into the major NGS repositories such as the american SRA or the european ENA.
See the description of the track "Genome Variants" in the UCSC genome Browser:
This track displays variant base calls
from the publicly released genome
sequences of several individuals:
* 5 Sub-Saharan African genomes sequenced by Penn State University:
o !Gubi (KB1),
o G/aq'o (NB1),
o !Ai (MD8),
o D#kgao (TK1),
o Archbishop Desmond Tutu (ABT),
* 6 individuals from the 1000 Genome Project high-coverage pilot:
o a CEU daughter and parents (NA12878, NA12891, NA12892)
o a YRI daughter and parents (NA19240, NA19238, NA19239)
* and independently published genomes:
o Craig Venter,
o James Watson,
o Anonymous Yoruba individual NA18507,
o Anonymous Han Chinese individual (YH, YanHuang Project),
o Seong-Jim Kim (SJK),
o Anonymous Korean individual (AK1),
o Stephen Quake,
o Anonymous Irish male,
o Extinct Palaeo-Eskimo Saqqaq individual
I do not know how one would define "assembly". But in the sense of de novo assembly, 5 are publicly available:
The official human reference genome
Celera assembly
Venter
YanHuang
NA18507
In the sense of mapping assembly, there are very few. For all the sequencing projects in the public domain, you can always get the raw reads, sometimes the list of SNPs and occasionally the alignment, but these are not really mapping assembly. In my definition of mapping assembly, you have to know which regions are accessible and which are not, but this is rarely available.
I have processed some of the published data sets in a uniform way. For people who are interested, they are here.