This contains my entry for the Caveman Challenge 1.11 (its about completing the tech tree without upgrading buildings)
Below I will explain my missions and strategy to accomplish this. The "Diamond" level of the Caveman Challenge is just career mode with the following limitations
No upgrading any buildings
Custom difficulty
Every slider on the lowest/harshest setting
Except for science gains at 20%
Details can be found on the Caveman challenge top