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