Build 100 Meteor towers.
Using only level 1 towers, Win any Chapter 4 (or later) mission.
Enable a Tower Augmentation item on any tower.
Using only Cannon towers, Win any Chapter 4 (or later) mission.
Use the command shuttle to move 6 map sections in Mission 6.
Using only Inferno towers, Win any Chapter 4 (or later) mission.
Using only Gun towers, Win any chapter 4 (or later) mission.
Build and fully upgrade each tower type in one mission.
Build 100 Temporal towers.
Build every tower and every upgrade for each tower.
Use the Reload Checkpoint option.
Survive 100 waves on any Super Grinder challenge mode.
Build 100 Laser towers.
Use the speed up control at 3x for a total of 60 seconds in any mission.
Win a Gold medal on Mission 19 without using the Command Shuttle.
Use the Core Teleport special weapon (Professor Taylor).
Build 100 Inferno towers.
Kill 10,000 aliens.
Use the Precision Targeting Special Weapon (Rear Admiral Phillips).
Beat a Chapter 4 mission or higher with zero cores captured.
Build 100 Tesla towers.
Use the Temporal Cannon Special Weapon (Colonel Rissler).
Build 100 Boost towers.
Use the Resource Reinforcement Special Weapon (Professor Briel).
Build at least 1 of each tower type in any single mission.
Build 100 Cannon towers.
Use the Tower Overcharge Special Weapon (Advisor Zacara).
Win a mission with at least 10,000 resources remaining.
Sell 10 towers or more in a single mission.
Sell 10 towers.
Win a mission with at least 5,000 resources remaining.
Inspect 10 aliens.
Survive 100 waves on Grinder challenge mode on any mission.
Build 100 Gun towers.
Build 50 towers of any type in one mission.
Kill an alien boss creature. (Juggernaut, Rumbler, Turtle, or Crasher)
Kill 1000 aliens.
Finish all the missions in Chapter 1 in Story Mode.
Save a core that is less than 10 seconds away from the map's exit point.
Kill 100 aliens.
Earn a Gold Medal.
Recover a loose core.
Kill an alien carrying a power core.
Build 20 towers of any type in one mission.
Use the Orbital Laser Special Weapon (General Cai).
Earn a silver (or better) medal.
Kill 1 alien.
Win any mission without selling any towers.
Win a mission with at least 1,000 resources remaining.
Earn a Bronze (or better) medal in a Single Player Mission.
Upgrade a level 1 tower to a level 2 tower.
Earn a gold medal on every mission in Story mode.
Win a chapter 4 (or later) mission with level 3 towers only and no selling.
Earn a Gold medal in a Coordinated Defense Multiplayer Mission.
Build 100 Concussion towers.
Use the reload checkpoint option five times in a single mission.
Earn 100 Gold Medals on any missions.
Earn a silver medal (or better) on all missions in the Story mode.
Complete the single player campaign in Story Mode.
Enable a Tower Augmentation Item on 10 Towers.
Build 100 Missile towers.
Play a DG Fighter Multiplayer mission.
Earn a Victory in a DG FighterMultiplayer mission.
Kill 50,000 aliens.
Earn a Bronze (or better) medal in a Coordinated Defense Multiplayer mission.
