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