As Pat mentioned, you can increase the number of default entries to 999 by adding the &limit=999. Anything beyond that is probably tell you that you need to apply a filter on the report.
Some reports will automatically list all entries - such as the Complete Player Summary
If this doesn't help, please let us know why you need more than 999 entries on a specific report.
For greater limits add "&limit=999" without the quotes to end of the URL line, I'll leave the rest to Mark.. 999 is the max limit.
As Pat mentioned, you can increase the number of default entries to 999 by adding the &limit=999. Anything beyond that is probably tell you that you need to apply a filter on the report.
Some reports will automatically list all entries - such as the Complete Player Summary
If this doesn't help, please let us know why you need more than 999 entries on a specific report.