Not a "super basic question" at all. Takes a little ingenuity.
Tools¦Find & Edit Keywords¦
In the middle:
performance history, number of impressions, all time, greater than, -1
Click "No changes right now. See results list."
When it returns your list "Download table as .csv" (option is above the keyword list)
And the gang's all there!
Might even be other ways too that I don't know...
Israel