Regarding "What achievement can Perl 6 claim?"

At least one is 6Model itself -- a generic object semantics and API which has been back ported to Perl 5, has been ported to the JVM (with a lot of optimization still pending) and as we see here is a reasonable design for part of a VM API.

As far as I know 6Model is the only candidate around for a low level object model that is flexible enough to implement the object semantics in most languages, low level enough to be be efficiently implemented in most VMs, etc.