Lost and F0wnd can be an awkward achievement to get using bots, but luckily there is a simple way to get it to happen in a 1v1 game using a single bot.

To get started, you'll want to do the following:

• Select 'Create Server'
  
• Pick any map (defuse maps are best)
  
• Set the game to have one bot
  
• Make sure the bot is set to 'Easy' difficulty
  
• Start the game
  
• Choose whichever team you'd like, the bot will join the opposition

Once you're in the game, type the following into the console:

• 'bot_pistols_only 1'
  
• 'sv_cheats 1; bot_loadout deagle; sv_cheats 0;
  
  What the above commands will do is force the bot to only use pistols, whilst the loadout command will force it to buy a deagle.

What you need to do is buy armour and avoid the bot at the start of every round. Without being shot/noticed, make your way to its spawn as fast as possible to see if it dropped its starting pistol.

Eventually, once it does buy the deagle, its starting pistol (USP-S or Glock) will be on the ground in the opposing team's spawn. All you need to do is swap your pistol for the bot's dropped one and kill the bot using their original pistol, then your achievement should trigger.

Please note that the bot may take until round two or three to buy the deagle (or whatever weapon you picked for its loadout). Just have patience and keep checking its spawn until you find the pistol.

A good way to lure the bot to you is to pick Terrorists as your team, grab the CT bot's pistol when they eventually drop it, plant the bomb, and then wait. CS:S bots tend to be pretty ignorant to their surroundings, so you'll probably be able to kill it with its original pistol whilst it's interested in defusing the bomb.

If you somehow fail and get killed, just quit out to the menu and repeat the process. Eventually your luck will line up and you'll get the acheivement.

Best of luck!