Full list of all 15 Band of Bugs achievements worth 250 gamerscore. It takes around 10-12 hours to unlock all of the achievements in the base game on Xbox 360.
The base game contains 12 achievements worth 200 Gamerscore, and there are 3 DLC packs containing 3 achievements worth 50 Gamerscore.
Complete the Tutorial
Use 25 skills or spells
Complete the single-player campaign
Earn five of every hit bonus type outside of the tutorials
Defeat an opponent by knocking him into the water
Show the barbarians up in food hunt
Win three multiplayer games
Earn 20 gold medals
Earn 30 points in a single Spider Hunter game
Freeze 50 water tiles
Host 10 multiplayer games
Win a scenario by knocking all opponents out of playable area
Complete the Red Kingdom downloadable campaign
Earn at least 10 gold medals from downloadable campaigns
Complete the Ninja Sticks of Fury downloadable campaign