Here is the full list of all 11 Real Boxing™ achievements.
Perform 100 counterattacks.
Win 50 fights.
Win a fight without getting hit.
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 your first fight.
Win your first fight by KO.
Complete the tutorial.