Isn't there a way to list raw events from segment.com, with all their attributes, on Keen.io?
It seems the UI only allows me to create aggregations.
I believe you're looking for extractions. These will give you the raw data from whatever source they were given to. Keep in mind however, that the performance of an extraction will generally be slower than any other kind of query. Furthermore, doing too many of them can cause irate Keen engineers* to get on your case.
*In this case, probably me.