I have some ideas for you:
1. I know Commodore put out a list of software titles available for the Amiga 1000 at launch or shortly after. Some friends and I went to the local computer store that sold the Amiga to see the new Amiga 1000. I remember seeing a list of titles on a promotional sheet from Commodore. The Bombjack site might have this as he has a ton of cool scanned in promotion material from Commodore (everyone really). I don't remember if the Amiga 100 was released or they got the Amiga 1000 demo in and were taking orders. I know I couldn't drive yet and being blown away by the demos.
2. I also think Info (or .info) magazine had a tradition of listing/reviewing all products for the 64/128 and I think they added the Amiga 1000 too. It was a pretty thorough list and they ran it every so many issues. That should be on the Bombjack site too.
3. Commodore had their own magazine and I think they did an announcement of the Amiga. I would check that issue too. Guess where you could find that? :-)
4. Also, Bombjack has a great collection of catalogs from all the major software development houses by year (Spring 1985/Fall 1985 etc) so you could download them and see the listing by developers. Activision, EA, Epyx, Broderbund and many more should be on there.
5. Finally, Wikipedia has a list of Amiga games here:
https://en.wikipedia.org/wiki/List_of_Amiga_games_(A–H)#AThey also list platforms for applications which should tell you if the Amiga was on the list and the year.
Just a few ideas.
Good Luck!!
-P