RESIDENT EVIL RESISTANCE

My Sam build used here some of his skills I selected helped speed up his Fists of Iron ability.

Here's my Sam build to help others get this tricky achievement a lot faster. Especially those really trying to get it, I spend a lot of time recently myself.

Fists of Iron
Brute Force

Dash Punch
Relentless

Brawler
Limit Break

Adrenaline
Last Stand

Equipment I used the following down below...
Iron Nails III
FMJ Rounds III
Mix Tape II
Mix Tape III

I used Last Stand, Brute Force and Mix Tape II & III to greatly speed up Sam's Fever Skill rate. Some of my choices greatly helps with damage as well since Brute Force does also play into that. Basically being low on health will ridiculously speed it up.

To clarify, I had to check a few hours long live stream. I even used an time calculator online every time I used Fists of Iron ability. The first one was the only time I done that within 90 seconds. I am well aware a lot of people are struggling to get this achievement.

I do hope my guide here helps you out. You also can cancel Fists of Iron early. Just make sure you quickly kill creatures to help speed the meter up. Other than that, it's somewhat luck if you'll get it or not.

According to the time calculator, I had extra time seconds wise before Sam's Fists of Iron activated there. Being downed actually plays perfectly into Last Stand ability. I'm glad I got revived not long afterwards.

Once you active it, make sure you hit creatures and kill them as well, this raises the fever skill and it will active sooner the 2nd time. If you dont do anything once you active it, it takes 120 seconds (2 minutes to charge again)