Join a Bot Server
If you want to get achievements offline, first you need to initialise the Developer Console.
From the Main Menu, select options and put a check in the box "Enable Developer Console"
Start a server, add a basic password, select one of the maps that are available in "Offline Practice" When the map starts, press the tilde button (the button left of the number 1) and type "tf_bot_add xx" where xx is equal to a number. If you wanted to add 9 bots you would type tf_bot_add 9
If the map is one of the practice maps the bots will activate, if not they will just sit in the spawn.
Yes.
You don't. Achievements are kept on a Valve database called the steam cloud. It is 99% impossible to un-achieve achievements.
You simply find them randomly as timed drops, you unbox them, you trade for them, or you do achievements
Its another Achievement but to complete it you have to finish 5 or more normal achievements.
Yes Team Fortress 2 is available in the Xbox Arcade Store.
I'm assuming you're talking about Team Fortress 2. If you're talking about Team Fortress Classic then Team Fortress 2 is your answer. Valve has not stated anything about creating a new TF2 game. They're still not done updating and expanding TF2.
Team Fortress Classic and Team Fortress 2 is developed by Valve Inc.
Team Fortress 2 was initially a Quake Mod (Team Fortress), for Capture the Flag and Team Deathmatch
Team Fortress happened in 1996.
Team Fortress 2 is the sequel to the video game Team Fortress. There are similar characters and missions in both games, but the main differences are the new maps and new statistics capability in Team Fortress 2.
Team Fortress does not have levels.
You can find Team Fortress 2 at store.steampowered.com