Simply earn a total of 50,000 Tackle Points on your profile.
This can be in any mode, and earnt via any method.
You will earn TP for catches, trophy catches, on and offline tournament placings.
The easiest way to grind fast is from the Talon or Kerr DLC offline tournaments, as that's 10/15k every 20mins. But you'll get this naturally easily just from playing.