Disable your first cow

Disable 25 cows by archers

Disable 25 cows by wizards

Disable 25 cows with artillery

Disable 25 cows by freezers

Build 4 kinds of towers in a single battle

Disable 200 ninja cows

Earn 5 barrels of milky Milk

Use Thor's Hammer succesfully for 50 times

Upgrade 15 towers in a single battle

Put out the same burning tower 10 times

Put out 50 burning towers

Sell 40 towers