There are actually two ways that you can unlock this achievement. Both of these ways has to be done in 'Play' matches against the AI,
The first way would be to use the 'Move Thief' Payback ability during a match. Have your superstar get beat up until both Payback meters are full, press RB + LB to use the Payback, steal the opponent's finisher, and win the match.
The second way you could unlock this trophy (and how I unlocked it, by accident) is by winning a match with a superstar that has a finishing move that happens to be the exact same finisher as your opponent. For example, I used a created female superstar that has the Dis-Arm-Her as a finisher, I then had a match against Becky Lynch (who uses the Dis-Arm-Her as her finisher), won the match with the move, and unlocked the achievement.
If there are any issues with this solution, please let me know and I'll edit this solution.