Foundry is a symmetrical map featuring "Standard Control Point" gameplay, meaning that both teams are attempting to capture all five points at the same time, in contrast to Dustbowl or Gravel Pit where one team attacks and the other defends.
Foundry also has twelve map-specific achievements. Unlocking at least seven of these will grant the player the Full Head of Steam hat.
Kill an enemy who is capturing a control point with a critical hit.
Capture a control point within 12 seconds after exiting a teleporter.
Get one or more kills as all nine classes in one round.
Win 137 Rounds.
Play through a back-and-forth battle for 15 control point captures.
Five the Fast Way
Capture the final control point within five seconds of your team capturing the previous control point.
Foundry Force Five
Play in a game with five or more players from your Friends list.
Achieve 7 of the achievements in the Foundry pack.
Raze the Roof
Kill two people on the roof of the center control point in a single life.
Win a round in which the enemy team has attempted to capture your final control point.
Kill a player by pushing them into the cauldron fire.
Two Minute Warring
Be part of a team that wins within two minutes.