This is a list of all the step free information from https://content.tfl.gov.uk/step-free-tube-guide-map.pdf

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It has taken a while to understand some of the information so an attempt has been made to have all the information on one Excel document.

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Additional notes have been added and it would appear that some of these have not been "tried and tested" by a wheelchair user as some of them really don't make any sense for real person usage! 

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An example of this is Borough - it is step free from the station entrance to the platform going to London Bridge, so if you were in a wheelchair, to get back to Borough, you would have to go down to Morden and then back up, which would make for a very long day out! Should it be advertised as Step Free is a good question, which could be put to TfL, if you have the time and energy to do so.