Here is the full list of all 21 Dorfs: Hammers for Hire achievements.
Deliver your first order
Win a level with at least two players
Win a level with each character
Win a level with maximum rampage without restarting
Unlock arcade mode
Catch an item that has been at least 2 seconds in mid air
Saw 100 logs
Hammer 100 hot Ingots
Capture 50 invasions
Deliver 200 orders
Find the Earth Rune
Find the Fire Rune
Find the Ice Rune
Deliver an order while poisoned
Earn 15 victories by completing the battle bar in the campaign
Capture 20 flags in arcade mode
Capture 60 flags in campaign
Unlock all bonus levels
Complete the campaign
Capture three flags in all campaign levels and bonus
Earn all trophies