Command show parser dump all will show all the valid CLI commands in the ASA firewall, including those not in the documentation.

Be carefull with it, more than 300 pages incoming :-)

Some of the VPN available commands are:

clear/show ipsec sa counters
clear/show crypto ipsec sa map
clear/show crypto protocol statistics ssl
clear/show crypto protocol statistics ssh
clear/show crypto protocol statistics srtp
clear/show crypto protocol statistics other
clear/show crypto protocol statistics all
clear/show vpn-sessiondb statistics
debug vpnlb
debug vpn-sessiondb
debug crypto isakmp timers
debug crypto ca messages
debug crypto condition peer
subnet
debug crypto condition peer
subnet
debug crypto condition peer
debug crypto condition user
debug crypto condition unmatched isakmp
debug crypto condition error ipsec
debug crypto condition error isakmp