No instructions are included. In the first save just finish one race will pop most achievements. Some saves are self explanatory by description (distance driven). For the Pacman achievement, just play one game in the garage the score does not matter. I believe you have to buy one Ferrari for another achievement.
For the international achievement just play against someone from another country (if the game is still playable online). The only players that used to be on were from japan, so it was pretty easy to join a random race and get the achievement.
Reminder: make sure that you copy over the entire "0000002" directory also. It includes all the keys necessary to use use the saves.
If you have any problems or questions, send me a message and I will try and help. I have done these many times but have not done so for a long time.