From Halopedia, the Halo wiki
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Catch This is an achievement in Halo: The Master Chief Collection. It is unlocked by earning a total of 500 Grenade Kill or Plasma Kill medals in multiplayer matchmaking. Strangely, Grenade Stick kills do not count towards the achievement. The achievement is worth 10 gamerpoints.
Players attempting to unlock the achievement should avoid playing Halo 3 multiplayer matches, as it is the only game in the Collection which does not award either of the medals required.