any tips for the bonus structure achivement?

[Legendary Old Legacy Image]

hi, i'm trying to get 100% in avww any tip on how to get more bonus structures? i'm trying to get to continent 4 atm

[ShadowOfTheTree]

You should do this achievement later in the game, for example on continent 7 or 8: if you want to get a legendary (the longest achievements to get), you need to farm a lot at continent 7 or more.
To get your structures, you need to enter a world (ice, desert, ....), then go in each building, and perform secret missions. You can also find those missions in the caves, but they are fewer.

[Watser]

In order to unlock more buildings you will be required to do certain tasks. There's a whole heap of 'things to do' with their respective rewards listed as well. Focus on those which grants buildings (I am currently struggling with 30 urban crawlers.... ♥♥♥♥ those are nowhere to be found!)

EDIT: Nevermind, you already got it.
Do you have any tips for Legendaries? Or do you just farm basements for chests? Also, Urban Crawlers? Xd

[ShadowOfTheTree]

Urban crawlers are found in abandonned towns. There is something like 1 per section (if you enter in an abandonned town, there are between 12 to 22 sections). They are more easily found after being world lvl3 or 4.

Regarding Legendaries, there is a thread where someone asked to the developpers what was the formula to get a legendary.
Roughly, you need to have a world of lvl 8 or more, then every when certains conditions are met, you will have a low probability to get a legendary. Note that the probability to generate a legendary is constant, the level of the world does not alter this probability (ie, if you farm world 8 or world 50 has the same probability)
So, if you want to get legendary, your only solution is to farm. Best place is buildings (such as pyramid).
Edith: I usually enter in each building. The only part of the building I don't go in is part with spikes on the floor.

[Legendary Old Legacy Image]

enter only in shacks and old sheds if the bulding have less than 3 floors don't even bother

[MrJohnnyTwoShoes]

It's a pain in the ass in my opinion. I put some screenshots and some my blah blah thoughts at
http://www.gravityboom.com/valley-without-wind-achievement-hunting/