In team fortress 2 how do I make static bots that still earn me achievements

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.