Titanfall 2 has 6 new ways to think about Titans and how to operate them by giving you six very different Titans from which to choose. Each Titan is extremely customizable, which means even though each Titan has its own style.
In Titanfall 2 you need to find every Pilot Helmet in order to unlock a special trophy / achievement. You can find these Pilot Helmets throughout your gameplay. You can check how many Helmets you have found in any mission by selecting it. Once you find any helmet your progress will be saved auto.