Recommended mods?

[ChaosCVZ]

What workshop mods, if any, do you recommend getting?
and does downloading/using a mod disable steam achievements?

[Dargenom]

Turning a regular save into a modded save permanently prevents you from getting achievements on that save file, but the game will ask if you want to copy the save first or not.

[Cheeseness]

I can only speak to the few mods I've had time to check out, but Lee's been highlighting interesting mods via our Mod Spotlight posts. So far there have only been two, but I'll be pulling them all into this collection.

shiva.js' Labyrinth mod is a great large-scale mod that's worth taking a peek at as well.