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So, here are the new achievements.
First, new creature tiers for the Empire and the Alliance:

Second, a new upgrade system. Now, level-ups will be more valuable and significant. The idea and a couple of icons were taken from another English-language mod, but I made some changes:

And here's an example of the stats for the Beastmaster:
Basic unit:

Fully upgraded:

With full upgrades, units become true aces, which means that development will not end with the final transformation. Transformation, as before, occurs at level 3.