I used both Lucas & Chris' solutions to gain the achievement.
I plugged in a 2nd pad and started a 2-player Local Game. Main profile as Player 1. Setup the maximum games (5) and on your MAIN profile keep upgrading your Attack & Midfield as much as it'll allow. Play each match and pick up as much money as you can for your main profile (allows further upgrades). The first 3 games I managed to injure the opposition, but until I'd maxed out the stats of my Attackers & Midfielder's, I couldn't damage them enough in the time alloted.
Once I got to the 4th Match, my Attackers AND Midfielder's had maximum stats (200 from what I can remember). During the 4th game I used Chris' solution of simply running directly at the GK, Tackling their Centre Forward & Centre Midfielder. Their CF went off injured before half-time. Their CM went off JUST after half-time. Their GK went with around 60 seconds of 2nd half left, then straight from KO their MR got injured (presumably by my AI Team-mates). Finally, their replacement CF was injured with 32 seconds remaining.
The best advice I can give is to upgrade as MUCH as possible as quickly as possible (might be worth using the first 3 games to gain as much cash as possible, without it you can't upgrade, and won't do enough damage without upgrading).
It was much easier than I thought and took about 10-20 minutes maximum.
Thanks to both Lucas & Chris for their solutions, without them I wouldn't have been able to finish the achievement as i've tried before.
Good luck to anyone who goes for it! ;-)