You are the Champion Trophy in Trans-Galactic Tournament
You are the Champion
Reach Level 30
How to unlock You are the Champion
For this and the above two trophies, you will need to reach level 30, which is the game's level cap that will be reached after obtaining 12,000 EXP while you are level 29.
If you have any free boosters for EXP saved after you reach level 6, I would highly recommend using them to get double EXP if you are certain that you would win the match. Each match that you lose in the game will give you half the EXP that you would normally get if you win the match.
You can check your current level in the main menu on the top-right corner, but you can also check how much EXP you have obtained before you reach the next level by going to your player profile. It should also be noted that the game does not have a counter for how much EXP you have accumulated in total, which could pose a problem for those wanting to know how much EXP they have collected.