Soldato
ah, press A when locked on just as the opponent starts his swing. Its a lot harder than Assassins Creed. Some characters seem to be easier to counter than others, bums take a pretty big swing for example. Anyone once the counter has been achieved (your character ducks) then press Y to do the counter attack. This is on 360 obviously.
Just tried this and it will be impossible to get 10 in 4 mins, maybe 1 out of every 10 counters actually works, rest of the time i just get beaten to a pulp