Planting A Flag is an achievement in Halo: The Master Chief Collection. It is unlocked by earning a total of 250 Capture the Flag mode-specific medals in multiplayer matchmaking. The achievement is worth 10 Gamerscore.

Certain games in the collection are better for earning this achievement than others, as not all games award the same number of Capture the Flag medals. Halo 2: Anniversary has the most with eleven unique medals, followed closely by Halo 4 with ten. Halo: Combat Evolved, Halo 2, and Halo 3 only award seven medals, while Halo: Reach only award three medals.

From launch until the April 2022 update, Halo 3 only awarded three medals, as with Reach. Following the update, four additional medals can be earned in Halo 3.

Medals added with the April 2022 update are marked with ¹ in the table below.

The medals contributing to the progress of this achievement and attainable in each game are as follows:

Icon Name HCE H2 H2A H3 H4 Reach
Flag Taken medal from Halo: The Master Chief Collection. Flag Taken Yes Yes Yes Yes¹ No No
Flag Returned medal from Halo: The Master Chief Collection. Flag Returned Yes Yes Yes Yes¹ No No
H4 - Flag Capture.png Flag Captured Yes Yes Yes Yes Yes Yes
H4 - Flag Runner.png Flag Runner Yes Yes Yes Yes¹ Yes No
H4 - Flag Champion.png Flag Champion Yes Yes Yes Yes¹ Yes No
H4 - Flag Assist.png Flag Assist No No Yes No Yes No
H4 - Flag Carrier Kill.png Flag Carrier Kill Yes Yes Yes Yes Yes Yes
H4 - Flag Defense.png Flag Defense No No Yes No Yes No
H4 - Flag Kill.png Flag Kill Yes Yes Yes Yes Yes Yes
H4 - Flagsassination.png Flagsassination No No No No Yes No
H4 - Flag Joust.png Flag Joust No No Yes No Yes No
H4 - Flag Driver.png Flag Driver No No Yes No Yes No