You can measure your success in battle any number of ways: amount of XP gained, number of enemy vehicles destroyed… you name it.
Another way you can measure it is by the number of Achievements or Trophies you complete.
Achievements and Trophies are in-game goals for you to pursue that are tied to your console. Achievements are specific to Xbox, while Trophies are the awards you’ll find on PlayStation.
Some are the same for Xbox and PlayStation tankers; others are different and exist only on one console. Variety is the spice of life!