If Chrome were still running, you could "Bookmark (all) open pages... Ctrl+Shift+D", even in an incognito window... but the whole point of incognito mode is to not leave any history of browsing, so once the window's closed the open tabs are forgotten.
Searching all it's memory is an idea... I'm not sure how or if you could differentiate between all the html links in all the webpages vs just the main page URLs.
I tried a test, having only one regular window open with three tabs, and one incognito window with one tab to a unique URL, and only about 200 entries of browsing history and less than a dozen bookmarks. Then:
Used the GNU debugger
gcore to make a core dump of my Chromium processes (850MB)
[I used Linux, but there should be plenty of equivalent windows tools too, for core dumps, strings & grep, like How can I configure windows to generate a core dump from an application?]
strings to just find strings of 4+ printable characters (37MB)
grep for the unique URL (unique.com)
The resulting file, lines only containing the unique URL, was 26kb and had 343 lines, all from just one open tab.
- [There were also some interesting results like
http://google.ca/search?q=uniqueURL&sourceid=chrome&ie=UTF-8 when I never searched google for the unique URL, and
https://staticxx.facebook.com/connect/xd_arbiter.php?...&origin=uniqueURLbut I'm assuming those are from the unique URL's page itself, my Chromium isn't supposed to be googling every URL I type.]
Searching the strings from step 2 for any URL with
egrep -o 'https?://[^ ]+' strings-file found 18,292 results.
You might be able to find your 100 lost tabs somewhere in the tens of thousands (or more) of URL's from a memory / core dump, but it might be a lot easier to just search google from your own personal memory of what you were browsing.