Obtaining Powerhouse achievements
From (Dev) Team Fortress Wiki
| Balance of Power|
Win a round in which the enemy team has attempted to capture your final control point.
How to obtain: After the enemy team has attempted to capture your last point, make a strong comeback. As Powerhouse has only three control points, compared to the five control points of other CP maps, this achievement may be easier and more common than the "Real Steal" and "Snakebit" achievements of Foundry and Snakewater, respectively.
| Power Down|
Kill 15 enemies while they are capturing a point on Powerhouse.
How to obtain: Target any enemy who is attempting to capture the center point or your final point.
| The Power and the Glory|
Win 142 rounds.
How to obtain: This achievement will naturally be obtained after a very significant amount of time playing on Powerhouse.
| Wet Work|
Kill five enemies while they are in the water.
How to obtain: If an enemy enters or is blasted into the water between the bases, target them while they are relatively trapped.
| Power Trip|
Capture the final control point within 15 seconds of your team capturing the previous control point.
How to obtain: Because Powerhouse only has three control points, the enemy team will likely take a defensive position as your team captures the central point. Instead of you charging in alone, your team should leave one or two members behind to capture the central point while the rest focus on clearing out the final point. If the enemy team aggressively counterattacks, it may be possible to sneak behind their lines as the Scout or Spy.