Elemental Forums
If a player completes a world achievement (Great Mill, Merchantcross Bazaar, etc.) they should get + 10 Fame as well.
+1 , except 10 Fame is excessive.
+1 fame for early game wonders, +3 fame for mid game wonders, +5 fame for late game wonders
lul
3rd hero require 200 fame, there is completely no reason to set fame bonus for 1permap construction at same level like destruction of regular monster lair.
The fame level of +10 fame per world wonder is reasonable. The heroes go up in a doubling scale and will be dimished returns late game.
There are only six World Achievements. Three provide 10 fame upon completion, one provides 1 fame per season, and the other two don't provide fame. Incidentally, the two you list as examples are two of the ones that do provide 10 fame.
Merchantcross Bazaar: +10 fame
Great Mill: +10 fame
Hosten's Library: +10 fame
Erog's Tower: +1 fame per season.
Iron Works and Treasury Vault do not provide fame.
Oops! I must have missed that! 
So let me amend to say I would like to see consistent fame awards for world achievements.
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