ANARCHY REIGNS
50 Achievements
1,000
20-25h
Big Combo Anarchy
Defeat an enemy with a combo of 100 hits or longer. (Campaign Mode)
40
How to unlock the Big Combo Anarchy achievement in ANARCHY REIGNS - Definitive Guide
Personally I think there is a combo timer so as long as you hit an enemy within the few seconds in between you won't loose your combo. The key though is to keep swinging with those punches.
I just started the game and have not done any missions, just by running around I got this. It was my 2nd achievement.
It's fairly simple to rack up combo count in this game, as you cannot lose your combo counter by getting hit or knocked down, only by waiting too long between hits (or by dying). You can farm this in Street Brawl (best to not use Easy difficulty since enemies die too quickly). You'll likely get this by accident during normal play, but if you are having trouble, try finding a fight with multiple mutant types, activating Rampage, and using repeated or attacks where you mash the button for hits.
Unlike most games, combos in Anarchy Reigns are not a string of attacks. Instead, they are simply attacking continually without long delays between attacks. You can easily unlock this anywhere in Street Brawl or even in White Side 1-1 Free on Hard where there are a ton of regular enemies without spawning a difficult enemy who could break your chain.
At the very beginning, anarchists attack you in droves, essentially endlessly, but with breaks for various environmental disasters. So, as soon as you were given control of Leo, you start hitting everyone running up to you with this combination , , since it is also scattering and you do this until the combo counter reaches 100 (after every 10 you will be warned with an inscription on the screen that you have scored 10, 20, 30, etc. combos). Once 100 appear, the trophy is yours. The combo counter will increase until you are damaged or the enemies flee due to the impending cataclysm.