Here is the full list of all 53 Knockout Master achievements.
Start a new game
Rescue Alice from the dangerous thug
Spy on Alice
Win by knockout
Dance with Alice & Leah
Successfully obtain your Amateur Boxing License
Win your first official match by knockout
Delight Rose by tipping her a generous $90
Help Leah rent the restaurant
Invite Mike to the BBQ
Make love with Alice in the kitchen
Invite Leah to the BBQ
Make love with Alice in your bedroom
Win the quarter finals match by knockout
Win the semi finals match by knockout
Celebrate with Alice
Celebrate with Leah
Have your first kiss with Rose
Help Leah by leaving a substantial tip
Kiss Rose after the date
Tell Rose that you're her boyfriend
Make love with Leah in her office
You have successfully impregnated Alice
You have successfully impregnated Leah
Relax in the hot tub with Alice
Make love with Leah while roleplaying
Invite Leah to live with you and Alice
Invite Leah to live in the spare house
Spy on Violet
Season 1 Complete
You got kicked out of the strip club
You had a fantastic night at the strip club
Unlock Secret Ending 1
Beat Twinky and shoot Liam
Ask for Leah's help at the hospital
Ask for Alice's help at the hospital
Ask for Alice's and Leah's help at the hospital
Do the analysis alone
Wetflix and chill with Alice
Round 11 Complete
Let Violet fall without catching her
You were able to catch Violet
Win the Final match by knockout
Invite Candy out for a date
Obtain your Professional Boxing License
Date Night with Rose, Round Two
Round 12 Complete
Provoke Manny ahead of the match