Invaders Repelled Achievement in Halo: The Master Chief Collection

The objective of the aforementioned gametype is simple: take control and hold the hill for the longest time or until the time requirement expires. If the game has a moving hill, you may need to search around the map for the new hill periodically. Also, this gametype may be played as a FFA or Team-based game.

All that is required is to kill five enemies that are attacking your position while you are holding the hill. Some useful tactics in pulling this off is to grab close-quarter weapons such as a Shotgun and wait inside the hill until enemies begin to ambush your position. All in all, this achievement is best done in Team King of the Hill in a Custom Game with at least one other player. When the match starts, simply stand in the hill (it won't move locations) and have your partner stand just outside the hill's boundaries. Proceed to kill your partner a total of five times and the achievement will unlock.