The Orange Box

The 25 headshots can be achieved in either player or ranked matches. For sniping I prefer 2fort or Dustbowl, in Dustbowl you can snipe the other team through the gate before the game starts if they are up next to it.

This is very easily boosted in a 1v1 with another friend. In fact, you can do this, Nemesis, and Hard to Kill all in the same session. This solution assumes you want to do all three at the same time.

Set up a match with all private slots, and invite your friend in. Set the timer to unlimited.

P1(red) sets up as sniper and goes to blu base. Headshot P2. Stay near the spawn spot, and have P2 come out and get his headshot. Do 5 straight headshots (Hard to Kill ach pops at this point).

Before you get the 5th headshot, you'll see that you're dominating P2. After the 5th headshot, switch roles, and let P2 headshot you 5 times, and have P2 move to P1 base. P2 gets a revenge kill for their first kill of you. Let them go forward to get 5 in a row (if they need Hard to Kill ach), and then go back and forth, with each player taking 4 headshots in a row at a time.

By doing it this way, you knock out both the Nemesis ach and the Grey Matter ach. All in, I think we took 30-45 mins tops to knock this out. It's really rather quick to get all of these.

Playing sniper on the map 2fort is the best way to get this achievement.

Tip: Aim so that the enemies can't see your laserdot. But if you see them aim quick and shoot. And if the objective is laying somewere try to aim there because people will run to it.

This one is fairly simple. The headshots don’t all have to be from one game so there is no rush when you’re trying to get them. I recommend 2Fort because there is always at least one enemy sniper on the battlements so it shouldn’t be that hard. Wait for your shot to charge up a bit and fire. It doesn’t take a fully charged shot to kill an enemy sniper, but power classes take at least a ¾ charged shot to kill in most cases.

Most Likely 2fort would be easy but if not 2fort then Dustbowl. Just Always go for the head and try no to aim down your sights because it will make a dot that is visible to the other team.