Complete the first level.

Unlock every tower and upgrade.

Complete every basic level.

Complete a challenge.

Complete every challenge level.

Defeat your first captain.

Build an aura tower.

Upgrade a tower.

Upgrade your first advanced tower.

Upgrade your first utility upgrade.

Reach wave 10 in a random map on very hard.

Reach wave 10 in a random map on hard.

Reach wave 10 in a random map on normal.

Reach wave 25 in a random map on very hard.

Reach wave 25 in a random map on hard.

Reach wave 25 in a random map on normal.

Reach wave 50 in a random map on very hard.

Reach wave 50 in a random map on hard.

Reach wave 50 in a random map on normal.