Why is cp_gullywash on the Attack/Defense mappool instead of Control Points mappool

You can check a box in the menu that saves a screenshot of the scoreboard, you can see all the stats on that.

The check-box can be found from the title screen here: Options > Advanced > Auto-save a scoreboard screenshot at the end of a map

The saved screenshots will be stored here: [Steam Folder]\steamapps[username]\team fortress 2\tf\screenshots

where:

• [Steam Folder] is the directory where Steam is installed (by default C:\Program Files\Steam)
• [username] is your Steam username

Here's my suggestion, based on the actual circumstances that earned me the Specialist achievement.

Play defense on pl_badwater. Make sure your team has a few competent damage sponges (Heavies, Soldiers, and Demomen) who know how to retreat (you may need to explain that bullets are hazardous to your health).

You want to stay alive. You can facilitate this by always sticking to a buddy. The best buddies to stick to are the ones that hang around sharp corners near narrow corridors:

In these locations, you and your buddy can stay behind cover in the yellow area, and once they are fully healed (to 150%, conditions permitting), they can venture into the red zone for ideal damage exchange along the highlighted lines of sight (where Heavies, Soldiers, and Demomen have a captive audience, so to speak, of the cart's escorts).

Note that the general advice here (be on a good team, play against a bad team, heal everybody) still applies, and that you'll still need classes like Engineers (who can help by putting dispensers near you) to cover your back.