I recently decided to swap around some Feats on my Fighter, and it made me realize how much of a pain it is not knowing what levels I actually took each Feat at. I had them listed initially, but have switched several around over the years, so I no longer know for certain.
When switching Feats by talking to Fred, that information is partially available, but ONLY for the Feats that are eligible to be swapped out...any prerequisite Feats are not listed because you cannot currently swap them. For Fighters in particular, this can be important because knowing what levels each was taken at, and whether or not it qualifies as a level or Fighter Feat, makes a huge impact on planning Feat changes. For example, trying to switch WF, WS, GWF, GWS and IC to another line and making sure that the BAB prerequisite is met at each step is far more complicated than it should be, not to mention that I have to wait 3 days between each switch.
I tried contacting an in-game GM, and they supposedly were not able to determine what Feats I had taken at each level. However it's done, providing this information could be very useful, and it seems like this should be able to be added to your Character Sheet list of Feats.