Silver Medal Achievement
Capture 25 flags in Capture the Flag ranked matchesHost a game and set the time to 30 minutes and five flags on a game of CTF on the level Manor House. Have one person from each team go for this achievement. Both get four flags each, then one person gets the final 5th flag. The next game, switch turns and have the person who got four flags get five flags and so on until you both get the achievement.
Note: You can not play 1 vs 1 ranked matches. Minimum is 3 vs 3!