FIGHT NIGHT CHAMPION

In order to get this achievement, your stamina has to be at 40% when you enter the fight. This means you complete a training activity that requires 50% stamina one week, rest the following week, do the same or similar activity the following week, putting you back at 50, and then do one of the non-playable activities that drains only 10% stamina, putting you at the required 40 before the fight. You should have booked a fight with a fighter who is as low a rank as you can compete against or one who has a shorter reach/shorter height/lower weight than your custom fighter. Prepare yourself to play all 10 rounds of this bout. The match should be ALL defense. wait for your opponent to throw punches and then attack when he's open. You'll likely get stunned numerous times during the fight, it is important to avoid knockdowns. DO NOT THROW a lot of power punches, your stamina is low enough as it is. If you play good defense and land more punches than your opponent, the judges should score in your favor (check the fight updates every few rounds to see whose winning the rounds on the scorecards). Do this and the achievement is yours.. Towards the end is typically most critical, just imagine you're fighting Isaac Frost again and STAY AWAY from your opponent's offense.

If you turn the settings down to the easy mode you can score a knock out in the first round if one of your punches is powered up high enough. That's what worked for me.

I did this on one of those fights where I was a last-minute replacement fighter and only had 2 weeks to prepare anyway, and I happened to be up against someone I had just knocked out pretty easily, so I knew it was winnable. I spent my two weeks training the maximum on Conditioning and Endurance, which brought me down to 40% stamina.

In the fight, I played as defensively as possible for the first 4 rounds. I'm a counter puncher, and my boxer has pretty good head movement and blocking (around 9 each), so I was able to dodge most of my opponent's punches. I threw the occasional counter (right-uppercut since that's my strongest punch), but mostly just bobbed and weaved.

By round 5, we were both down to about 30% stamina. I started to throw a few more punches, and I was careful to be as accurate as possible while also keeping my defense strong and going for counter punch opportunities. KO happened in round 6 after two knockdowns.