Here is the full list of all 11 Real Boxing™ achievements.
Perform 100 counterattacks.
Win 50 fights.
Fully train your character.
Win the Boxing Legends belt.
Win all belts without getting knocked down once in the process.
Win the Night of the Champions belt.
Win the Roosters' Tournament belt.
Win a fight without getting hit.
Win your first fight by KO.
Win your first fight.
Complete the tutorial.