Usually, when you play with bots, they have the same amount of money as you, or even more. Therefore they can buy weapons themselves. You cannot ask them to spend all of their money or drop their weapons, so obtaining the achievement in question seems to be impossible with bots.

It is possible however to overcome this limitation. In a nutshell, you have to earn money first (without bots), and only then add bots to your team. Here is a detailed walkthrough.

First, create a new listen server with some bots (be sure to set Max Players to 32). I recommend using skill difficulty Easy and playing on cs_militia. Join the Counter-Terrorists team.

Then open console (the ~ key) and start typing some commands. Specifically, you will need these:

Some explanation of these. Limit teams allows unbalanced teams, so that in one team (yours) there may be 10+ players, while on the other just one. Start money command should be self-explanatory. Join team command allows bots automatically join both teams. The quota command limits the amount of bots on the server to just one (for now). After this command is executed, all the excess bots on the server should be kicked, leaving just you in CT team, and one bot in the Terrorists team. Next command allows bots to use any weapon. This is important, because if you throw a rifle to the bot, while he is not allowed to use it, it won't count for this achievement.

The bind commands bind some scripts to the F7 and F8 keys on your keyboard (of course, you are free to use any other keys you like, just care not to specify the keys you use for something else).

Besides typing these commands into console, you might want to select the Show on HUD checkbox next to the achievement in Achievements menu so that you would see the achievement progress.

All right, the preparations should now be completed, ready for the main action.

Click the F7 key on your keyboard (or the key you bound through the console if you decided to bind to some other key). This should restart the game, giving you just $800 money. Do not spend it, just go and kill the bot on the Terrorists team - if you've done everything correctly, there should be only one. Sometimes you may get lucky so that you will be able to rescue hostages (this rewards you more money).

If you lost the first round (the bot killed you), wait for the start of the next round and press the F7 key again. After approximately 1 second the game will be reset and you may start from the beginning of this section.

If you won the first round, wait till the start of the next round. When it starts, buy some weapon, just not any pistols or grenades (I recommend buying Schmidt Machine Pistol SMG because it is the cheapest, so you will be able to buy several of them in the same round). When the weapon is bought, press the F8 key and the bot will spawn on your team. Now try to throw him the weapon you bought. If he 'catches' it (or simply runs over it as it is lying on the ground), you should be rewarded 1 point towards achievement completion.

If you have money for another weapon, buy one more, and press the F8 button again. Another bot spawns so that you may throw him another weapon. NOTE: if some considerable time has passed since the start of the round, another bot will be added to your team, but will not spawn immediately.

When you're out of money, just start over from the beginning of this section until you get the achievement. Alternatively you may just wait till the start of the next round, and you will be awarded money for winning (lots of bots on your team versus just one terrorist means you almost guaranteed to win the round).

If you throw a weapon, but miss the bot (so that bot runs away without the weapon), do not pick it up. Because if you do, this weapon will not count towards the achievement in question even if you ultimately successfully donate it to the bot. Instead, you might hope that the next bot you spawn will run over this weapon and pick it up.

In other words, each weapon may be donated just once. If you pick up the weapon you threw, throwing it again will not count as donation. You may pick up the weapons from fallen enemies and donate those, and it will count (as long as you throw them just once).

I hope this guide really helped you to get the achievement without reducing yourself to asking for help from somebody else.