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