You can now choose to start Free Farming with $5 million in the bank, so this is a very easy achievement. I believe this is an increase from when the game first released.
From the main menu, scroll over to Free Farming and select a New Game. Select Montana and a start balance of 5 000 000. Weather and time of day do not matter. Select "Start Free Farming" to begin.
to bring up the map. Use
to zoom out a bit. On the right hand side above the river is the Trade Center. Move the cursor over it and press
to teleport there.
to close the map once you've arrived.
Approach the man at the orange marker. When you stand in the circle near him you can press
to "Buy machine".
Select Combines. There are only 3 machines you need and you will have already started with the Gomselmash PALESSE GS575 - $90 000. You just need to purchase:
Agromash 4000 - $105 000
Gomselmash PALESSE GS16 - $179 000
You will unlock this achievement along with: