Build 100 Meteor towers.

Build 100 Tesla towers.

Build 100 Cannon towers.

Build 100 Missile towers.

Build 100 Concussion towers.

Build 100 Boost towers.

Use the Orbital Laser Special Weapon (General Cai).

Use the Temporal Cannon Special Weapon (Colonel Rissler).

Use the Resource Reinforcement Special Weapon (Professor Briel).

Use the Tower Overcharge Special Weapon (Advisor Zacara).

Use the Core Teleport special weapon (Professor Taylor).

Use the Precision Targeting Special Weapon (Rear Admiral Phillips).

Build every tower and every upgrade for each tower.

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

Win any mission without selling any towers.

Build 1 of each tower type in any single mission.

Inspect 10 aliens.

Build and fully upgrade each tower type in one mission.

Using only Gun towers, Win any chapter 4 (or later) mission.

Using only Inferno towers, Win any chapter 4 (or later) mission.

Using only Cannon towers, Win any chapter 4 (or later) mission.

Using only level 1 towers, Win any Chapter 4 (or later) mission.

Complete the single player campaign in Story Mode.

Earn a silver medal (or better) on all missions in the Story mode.