Kill 50 monsters in total.

Build 10 towers in total.

Build 20 resource buildings in total.

Purchase 1 relic.

Complete any stage for the first time.

Kill 500 monsters in total.

Kill 10,000 monsters in total.

Purchase 4 relics in total.

Purchase 8 relics in total.

Build 200 towers in total.

Complete any stage on Hard difficulty.

Complete any stage on Hard difficulty without letting any enemies through.

Complete the final stage.

Earn 3 stars on all stages.