Own 10000 garden coins.

Own 20 garden gnomes.

Own the most expensive gnome.

Throw trash onto the roof and make sure it stays there.

Own 2500 garden coins.

Own 1000 garden coins.

Cultivate a field of 25 fully-grown plants of the same type.

Throw 10 garbage objects out of your garden.

Throw trash into the garbage container from a significant distance.

Unlock a garden extension.

Give your cat some water.

Own 50 garden coins.

Get killed by the Alien 100 times