Build every tower and every upgrade for each tower.

Enable a Tower Augmentation item on any tower.

Use the Reload Checkpoint option.

Build 100 Boost towers.

Build 50 towers of any type in one mission.

Sell 10 towers or more in a single mission.

Save a core that is less than 10 seconds away from the map's exit point.

Kill 1000 aliens.

Kill an alien carrying a power core.

Win any mission without selling any towers.

Kill 100 aliens.

Earn a Gold Medal.