Motionsports

Best done against The Amazonian Devil. Load up the level and then play defensively.

Always keep your guard up and aim for the three knowndowns in the first round to win more easily. Every two or three punches he throws (watch out for his very basic left/right combo which can ruin your try for this achievement) throw no more than two straight punches (uppercuts are far more powerful but slower to execute of course) and then drop back into your guard.

Whittle away at his health and you'll soon unlock this one after a few tries.

If you can, fire up uPlay and buy the powered up boxing gloves to give your punches that extra sting, making ending the match much easier.

Easiest to do on the 2 player vs match. Just grab a friend, let them hit you once whilst you parry, then get them to put their hands at their sides and keep throwing punches to knock them out. You will also win the chieve for not being punched. If you land 85% of punches you will get a 3rd chieve too ;)