Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Clean Slate	Reach Wave 40 without losing any lives.
Cover Grounds	Unknown.
Garden Square	Build a 3x3 Garden.
High Road	Build a straight path of fifteen tiles.
Moat	Unknown.
Mountain Range	Build an isle with a width of 40.
Penny Pincher	Hold 99 coins.
Spearhead	Have a spike trap place spikes on all of its four sides.
Water World	Build a lake consisting of twenty water tiles.