The requirements are as follows:
1) You must have found at least one cache in ten different states. The caches can be of any type, and can be found at any time before or after the listing of this challenge.
2) You must have found at least one cache in a country other than the United States. The cache can be of any type, and can be found at any time before or after the listing of this challenge.
Proof of qualification for this challenge can be done in any reasonable manner you see fit (bookmark, list finds in log, public statistics, etc).
The cache container is large enough for small trade items. Please feel free to leave a small momento from locations you have visited during your caching travels. Happy hunting!