This will unlock during DAY 1 of your first playthrough, which serves as a tutorial. After your first fight, you will be given the Ram Guardian and shown how to equip it.
Follow the instructions and the achievement will unlock after your next fight.
--With the ram guardian, you start the match with 1 "auto" combo breaker, meaning you can input the wrong strength breaker and still be successful. You build additional charges of the ability by taking damage. Perform 100 auto breakers to unlock