Obtaining Snakewater achievements
Kill 15 enemies in the rafters above the central capture point.
How to obtain: Mobile enemies, such as Scouts, Soldiers, or Demomen, frequently make use of high ground to gain the advantage in combat. If enemies show up on the top, either target them using one of the aforementioned classes or pick them off from afar as the Sniper.
While rocket jumping, use a rocket to kill a rocket jumping enemy who also kills you with a rocket.
Difficulty: Very Hard
How to obtain: You and your enemy must be a Soldier in order to obtain this achievement. Both of you need to rocket jump, and, with precise aiming, shoot each other with a rocket and both of you must kill each other quickly. It's easy to get this if you have a Direct Hit, fire a critical rocket, or have low health. It can also work with splash damage if you're both near a wall.
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.
Win 141 Rounds.
How to obtain: This achievement will naturally be obtained after a very, very significant amount of time playing on Snakewater.
Wipe the other team with 12 or more players on the server.
How to obtain: The achievement requires at least 12 people, your team needs to kill the entire enemy team.