Gameplay

Shields Up!

From Halopedia, the Halo wiki

Shields Up! is an achievement in Halo: The Master Chief Collection. It is unlocked by activating the center energy shield three times in one match on Zenith in Halo 2: Anniversary multiplayer matchmaking. The achievement is worth 10 Gamerscore. It also unlocks the "Overshield" Multiplayer Emblem.