I would go with something similar to J.R.'s suggestion:
It contains all the information on what one is thinking about.
Prepositions on or about are commonly used (with information) to convey that the thing mentioned has something as a topic (see ODO def 3).
Since you already have one about used at the end, to avoid repetition you can go with on and get the same meaning.
Example of such usage:
The pamphlet provides a lot of information on recent changes to the tax laws.
An aside: this Google Ngram gives a rough image of how often information on is used.
"Information that tells" is not ungrammatical, but it sounds unidiomatic to me.