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