Here is the full list of all 15 Mushroom Wars achievements.
Achieve maximum attack level
Achieve victory on all Skirmish maps on highest difficulty
Earn all 9 rewards in a single Campaign level
Win a Skirmish game
Complete Campaign in under 60 minutes.
Complete Campaign
Complete Campaign on highest difficulty
Capture an enemy building without having any of your own
Encounter aliens in Campaign
Upgrade your village to level 5
Achieve level 5 morale
Earn each reward at least once
Capture 300 enemy buildings
Encounter forest warriors in Campaign
Earn all rewards in all Campaign levels